21202231312 has 40 divisors (see below), whose sum is σ = 42879576960. Its totient is φ = 10136839680.

The previous prime is 21202231307. The next prime is 21202231331. The reversal of 21202231312 is 21313220212.

It is a super-2 number, since 2×21202231312² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21202231312.

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 in 7 ways as a sum of consecutive naturals, for example, 1376389 + ... + 1391707.

It is an arithmetic number, because the mean of its divisors is an integer number (1071989424).

Almost surely, 2^21202231312 is an apocalyptic number.

It is an amenable number.

21202231312 is an abundant number, since it is smaller than the sum of its proper divisors (21677345648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202231312 is a wasteful number, since it uses less digits than its factorization.

21202231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19111 (or 19105 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21202231312 its reverse (21313220212), we get a palindrome (42515451524).

The spelling of 21202231312 in words is "twenty-one billion, two hundred two million, two hundred thirty-one thousand, three hundred twelve".