21201022102 has 16 divisors (see below), whose sum is σ = 34253154432. Its totient is φ = 9783558720.

The previous prime is 21201022081. The next prime is 21201022123. The reversal of 21201022102 is 20122010212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21201022081) and next prime (21201022123).

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115483 + ... + 236089.

It is an arithmetic number, because the mean of its divisors is an integer number (2140822152).

Almost surely, 2^21201022102 is an apocalyptic number.

21201022102 is a deficient number, since it is larger than the sum of its proper divisors (13052132330).

21201022102 is a wasteful number, since it uses less digits than its factorization.

21201022102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127383.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21201022102 its reverse (20122010212), we get a palindrome (41323032314).

The spelling of 21201022102 in words is "twenty-one billion, two hundred one million, twenty-two thousand, one hundred two".