120505021 has 16 divisors (see below), whose sum is σ = 149990400. Its totient is φ = 94267008.

The previous prime is 120505009. The next prime is 120505031.

120505021 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120505021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120504986 and 120505004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120505031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660 + ... + 15538.

It is an arithmetic number, because the mean of its divisors is an integer number (9374400).

Almost surely, 2^120505021 is an apocalyptic number.

It is an amenable number.

120505021 is a deficient number, since it is larger than the sum of its proper divisors (29485379).

120505021 is a wasteful number, since it uses less digits than its factorization.

120505021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14988.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 120505021 is about 10977.4778979509. The cubic root of 120505021 is about 493.9333847244.

It can be divided in two parts, 12050 and 5021, that added together give a palindrome (17071).

The spelling of 120505021 in words is "one hundred twenty million, five hundred five thousand, twenty-one".