21001222102 has 64 divisors (see below), whose sum is σ = 39542114304. Its totient is φ = 8160445440.

The previous prime is 21001222079. The next prime is 21001222127. The reversal of 21001222102 is 20122210012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 733027 + ... + 761137.

It is an arithmetic number, because the mean of its divisors is an integer number (617845536).

Almost surely, 2^21001222102 is an apocalyptic number.

21001222102 is a deficient number, since it is larger than the sum of its proper divisors (18540892202).

21001222102 is a wasteful number, since it uses less digits than its factorization.

21001222102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28253.

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

Adding to 21001222102 its reverse (20122210012), we get a palindrome (41123432114).

The spelling of 21001222102 in words is "twenty-one billion, one million, two hundred twenty-two thousand, one hundred two".