120102021 has 112 divisors (see below), whose sum is σ = 220348800. Its totient is φ = 64665216.

The previous prime is 120102013. The next prime is 120102077. The reversal of 120102021 is 120201021.

It is not a de Polignac number, because 120102021 - 2³ = 120102013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 120101994 and 120102012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120102001) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 4141435 + ... + 4141463.

It is an arithmetic number, because the mean of its divisors is an integer number (1967400).

Almost surely, 2^120102021 is an apocalyptic number.

It is an amenable number.

120102021 is a deficient number, since it is larger than the sum of its proper divisors (100246779).

120102021 is a wasteful number, since it uses less digits than its factorization.

120102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 87 counting only the distinct ones).

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

The square root of 120102021 is about 10959.1067610458. The cubic root of 120102021 is about 493.3821560621.

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

The spelling of 120102021 in words is "one hundred twenty million, one hundred two thousand, twenty-one".