21312312244 has 12 divisors (see below), whose sum is σ = 38090090304. Its totient is φ = 10429429304.

The previous prime is 21312312239. The next prime is 21312312253. The reversal of 21312312244 is 44221321312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56681494 + ... + 56681869.

It is an arithmetic number, because the mean of its divisors is an integer number (3174174192).

Almost surely, 2^21312312244 is an apocalyptic number.

It is an amenable number.

21312312244 is a deficient number, since it is larger than the sum of its proper divisors (16777778060).

21312312244 is a wasteful number, since it uses less digits than its factorization.

21312312244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113363414 (or 113363412 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 21312312244 its reverse (44221321312), we get a palindrome (65533633556).

The spelling of 21312312244 in words is "twenty-one billion, three hundred twelve million, three hundred twelve thousand, two hundred forty-four".