102021211111221 has 96 divisors (see below), whose sum is σ = 152903793070080. Its totient is φ = 65497854901248.

The previous prime is 102021211111213. The next prime is 102021211111427. The reversal of 102021211111221 is 122111112120201.

It is a happy number.

102021211111221 is a `hidden beast` number, since 10 + 202 + 121 + 1 + 111 + 221 = 666.

It is not a de Polignac number, because 102021211111221 - 2³ = 102021211111213 is a prime.

It is a super-2 number, since 2×102021211111221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102021211111194 and 102021211111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021211111121) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 44414979745 + ... + 44414982041.

It is an arithmetic number, because the mean of its divisors is an integer number (1592747844480).

Almost surely, 2^{102021211111221} is an apocalyptic number.

It is an amenable number.

102021211111221 is a deficient number, since it is larger than the sum of its proper divisors (50882581958859).

102021211111221 is a wasteful number, since it uses less digits than its factorization.

102021211111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523 (or 4520 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 102021211111221 its reverse (122111112120201), we get a palindrome (224132323231422).

The spelling of 102021211111221 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty-one".