102001211220021 has 16 divisors (see below), whose sum is σ = 139703794137600. Its totient is φ = 66150414203328.

The previous prime is 102001211219989. The next prime is 102001211220061. The reversal of 102001211220021 is 120022112100201.

It is not a de Polignac number, because 102001211220021 - 2⁵ = 102001211219989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001211220061) 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, 86450386 + ... + 87622323.

It is an arithmetic number, because the mean of its divisors is an integer number (8731487133600).

Almost surely, 2^{102001211220021} is an apocalyptic number.

It is an amenable number.

102001211220021 is a deficient number, since it is larger than the sum of its proper divisors (37702582917579).

102001211220021 is a wasteful number, since it uses less digits than its factorization.

102001211220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174078028.

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

Adding to 102001211220021 its reverse (120022112100201), we get a palindrome (222023323320222).

The spelling of 102001211220021 in words is "one hundred two trillion, one billion, two hundred eleven million, two hundred twenty thousand, twenty-one".