21976852213 has 8 divisors (see below), whose sum is σ = 22105039320. Its totient is φ = 21848739840.

The previous prime is 21976852211. The next prime is 21976852259. The reversal of 21976852213 is 31225867912.

It can be written as a sum of positive squares in 4 ways, for example, as 6396320529 + 15580531684 = 79977^2 + 124822^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21976852213 - 2¹ = 21976852211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21976852211) 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, 637893 + ... + 671461.

It is an arithmetic number, because the mean of its divisors is an integer number (2763129915).

Almost surely, 2^21976852213 is an apocalyptic number.

It is an amenable number.

21976852213 is a deficient number, since it is larger than the sum of its proper divisors (128187107).

21976852213 is a wasteful number, since it uses less digits than its factorization.

21976852213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37367.

The product of its digits is 362880, while the sum is 46.

The spelling of 21976852213 in words is "twenty-one billion, nine hundred seventy-six million, eight hundred fifty-two thousand, two hundred thirteen".