21242131202 has 4 divisors (see below), whose sum is σ = 31863196806. Its totient is φ = 10621065600.

The previous prime is 21242131187. The next prime is 21242131217. The reversal of 21242131202 is 20213124212.

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

It is an interprime number because it is at equal distance from previous prime (21242131187) and next prime (21242131217).

It can be written as a sum of positive squares in only one way, i.e., 19585722601 + 1656408601 = 139949^2 + 40699^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310532799 + ... + 5310532802.

Almost surely, 2^21242131202 is an apocalyptic number.

21242131202 is a deficient number, since it is larger than the sum of its proper divisors (10621065604).

21242131202 is a wasteful number, since it uses less digits than its factorization.

21242131202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10621065603.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21242131202 its reverse (20213124212), we get a palindrome (41455255414).

The spelling of 21242131202 in words is "twenty-one billion, two hundred forty-two million, one hundred thirty-one thousand, two hundred two".