120021021 has 20 divisors (see below), whose sum is σ = 180675264. Its totient is φ = 79396200.

The previous prime is 120021017. The next prime is 120021023. The reversal of 120021021 is 120120021.

It is not a de Polignac number, because 120021021 - 2² = 120021017 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 120020994 and 120021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4956 + ... + 16266.

Almost surely, 2^120021021 is an apocalyptic number.

It is an amenable number.

120021021 is a deficient number, since it is larger than the sum of its proper divisors (60654243).

120021021 is a wasteful number, since it uses less digits than its factorization.

120021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11454 (or 11445 counting only the distinct ones).

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

The square root of 120021021 is about 10955.4105810782. The cubic root of 120021021 is about 493.2712144312.

Adding to 120021021 its reverse (120120021), we get a palindrome (240141042).

The spelling of 120021021 in words is "one hundred twenty million, twenty-one thousand, twenty-one".