120201021 has 6 divisors (see below), whose sum is σ = 173623710. Its totient is φ = 80134008.

The previous prime is 120201019. The next prime is 120201023. The reversal of 120201021 is 120102021.

It is an interprime number because it is at equal distance from previous prime (120201019) and next prime (120201023).

It can be written as a sum of positive squares in only one way, i.e., 100220121 + 19980900 = 10011^2 + 4470^2 .

It is not a de Polignac number, because 120201021 - 2¹ = 120201019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 13355669 = 120201021 / (1 + 2 + 0 + 2 + 0 + 1 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 120200994 and 120201012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120201023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6677826 + ... + 6677843.

It is an arithmetic number, because the mean of its divisors is an integer number (28937285).

Almost surely, 2^120201021 is an apocalyptic number.

It is an amenable number.

120201021 is a deficient number, since it is larger than the sum of its proper divisors (53422689).

120201021 is a wasteful number, since it uses less digits than its factorization.

120201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13355675 (or 13355672 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 120201021 is about 10963.6226221081. The cubic root of 120201021 is about 493.5176836696.

Adding to 120201021 its reverse (120102021), we get a palindrome (240303042).

It can be divided in two parts, 12020 and 1021, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 120201021 in words is "one hundred twenty million, two hundred one thousand, twenty-one".