120021002100021 has 16 divisors (see below), whose sum is σ = 174576721693248. Its totient is φ = 72739701840000.

The previous prime is 120021002100001. The next prime is 120021002100061. The reversal of 120021002100021 is 120001200120021.

It is not a de Polignac number, because 120021002100021 - 2¹³ = 120021002091829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021002100001) 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, 788715 + ... + 15513351.

It is an arithmetic number, because the mean of its divisors is an integer number (10911045105828).

Almost surely, 2^{120021002100021} is an apocalyptic number.

120021002100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120021002100021 is a deficient number, since it is larger than the sum of its proper divisors (54555719593227).

120021002100021 is a wasteful number, since it uses less digits than its factorization.

120021002100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14971652.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 120021002100021 its reverse (120001200120021), we get a palindrome (240022202220042).

The spelling of 120021002100021 in words is "one hundred twenty trillion, twenty-one billion, two million, one hundred thousand, twenty-one".