21131102 has 12 divisors (see below), whose sum is σ = 33671760. Its totient is φ = 9943776.

The previous prime is 21131087. The next prime is 21131137. The reversal of 21131102 is 20113112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17702 + ... + 18857.

It is an arithmetic number, because the mean of its divisors is an integer number (2805980).

Almost surely, 2^21131102 is an apocalyptic number.

21131102 is a deficient number, since it is larger than the sum of its proper divisors (12540658).

21131102 is a wasteful number, since it uses less digits than its factorization.

21131102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36595 (or 36578 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21131102 is about 4596.8578398728. The cubic root of 21131102 is about 276.4653547558.

Adding to 21131102 its reverse (20113112), we get a palindrome (41244214).

It can be divided in two parts, 2113110 and 2, that added together give a palindrome (2113112).

The spelling of 21131102 in words is "twenty-one million, one hundred thirty-one thousand, one hundred two".