21310331002 has 4 divisors (see below), whose sum is σ = 31965496506. Its totient is φ = 10655165500.

The previous prime is 21310330981. The next prime is 21310331017. The reversal of 21310331002 is 20013301312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11906956161 + 9403374841 = 109119^2 + 96971^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5327582749 + ... + 5327582752.

Almost surely, 2^21310331002 is an apocalyptic number.

21310331002 is a deficient number, since it is larger than the sum of its proper divisors (10655165504).

21310331002 is a wasteful number, since it uses less digits than its factorization.

21310331002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10655165503.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21310331002 its reverse (20013301312), we get a palindrome (41323632314).

The spelling of 21310331002 in words is "twenty-one billion, three hundred ten million, three hundred thirty-one thousand, two".