102120002121221 has 32 divisors (see below), whose sum is σ = 123402344693760. Its totient is φ = 82613659512384.

The previous prime is 102120002121217. The next prime is 102120002121257. The reversal of 102120002121221 is 122121200021201.

It is not a de Polignac number, because 102120002121221 - 2² = 102120002121217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102120002121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120002121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17598191 + ... + 22670163.

It is an arithmetic number, because the mean of its divisors is an integer number (3856323271680).

Almost surely, 2^{102120002121221} is an apocalyptic number.

It is an amenable number.

102120002121221 is a deficient number, since it is larger than the sum of its proper divisors (21282342572539).

102120002121221 is a wasteful number, since it uses less digits than its factorization.

102120002121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5073665.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102120002121221 its reverse (122121200021201), we get a palindrome (224241202142422).

The spelling of 102120002121221 in words is "one hundred two trillion, one hundred twenty billion, two million, one hundred twenty-one thousand, two hundred twenty-one".