102121020120021 has 12 divisors (see below), whose sum is σ = 158391786308832. Its totient is φ = 58354868639928.

The previous prime is 102121020120001. The next prime is 102121020120029. The reversal of 102121020120021 is 120021020121201.

It is not a de Polignac number, because 102121020120021 - 2⁹ = 102121020119509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121020120029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 347350408425 + ... + 347350408718.

It is an arithmetic number, because the mean of its divisors is an integer number (13199315525736).

Almost surely, 2^{102121020120021} is an apocalyptic number.

It is an amenable number.

102121020120021 is a deficient number, since it is larger than the sum of its proper divisors (56270766188811).

102121020120021 is an equidigital number, since it uses as much as digits as its factorization.

102121020120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694700817160 (or 694700817153 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 102121020120021 its reverse (120021020121201), we get a palindrome (222142040241222).

The spelling of 102121020120021 in words is "one hundred two trillion, one hundred twenty-one billion, twenty million, one hundred twenty thousand, twenty-one".