21313842356 has 24 divisors (see below), whose sum is σ = 37429392000. Its totient is φ = 10619786304.

The previous prime is 21313842353. The next prime is 21313842371. The reversal of 21313842356 is 65324831312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313842353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1693535 + ... + 1706073.

It is an arithmetic number, because the mean of its divisors is an integer number (1559558000).

Almost surely, 2^21313842356 is an apocalyptic number.

It is an amenable number.

21313842356 is a deficient number, since it is larger than the sum of its proper divisors (16115549644).

21313842356 is a wasteful number, since it uses less digits than its factorization.

21313842356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13991 (or 13989 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The spelling of 21313842356 in words is "twenty-one billion, three hundred thirteen million, eight hundred forty-two thousand, three hundred fifty-six".