21011222102 has 24 divisors (see below), whose sum is σ = 34465649040. Its totient is φ = 9601456800.

The previous prime is 21011222101. The next prime is 21011222149. The reversal of 21011222102 is 20122211012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011222101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273602 + ... + 341877.

It is an arithmetic number, because the mean of its divisors is an integer number (1436068710).

Almost surely, 2^21011222102 is an apocalyptic number.

21011222102 is a deficient number, since it is larger than the sum of its proper divisors (13454426938).

21011222102 is a wasteful number, since it uses less digits than its factorization.

21011222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615608 (or 615595 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21011222102 its reverse (20122211012), we get a palindrome (41133433114).

The spelling of 21011222102 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, one hundred two".