21311021102 has 12 divisors (see below), whose sum is σ = 37185557400. Its totient is φ = 9133294716.

The previous prime is 21311021101. The next prime is 21311021111. The reversal of 21311021102 is 20112011312.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108729602 + ... + 108729797.

It is an arithmetic number, because the mean of its divisors is an integer number (3098796450).

Almost surely, 2^21311021102 is an apocalyptic number.

21311021102 is a deficient number, since it is larger than the sum of its proper divisors (15874536298).

21311021102 is a wasteful number, since it uses less digits than its factorization.

21311021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217459415 (or 217459408 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21311021102 its reverse (20112011312), we get a palindrome (41423032414).

The spelling of 21311021102 in words is "twenty-one billion, three hundred eleven million, twenty-one thousand, one hundred two".