213021878965 has 48 divisors (see below), whose sum is σ = 310118989824. Its totient is φ = 139902336000.

The previous prime is 213021878921. The next prime is 213021878969. The reversal of 213021878965 is 569878120312.

It is a happy number.

It is not a de Polignac number, because 213021878965 - 2¹⁵ = 213021846197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213021878969) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 592140 + ... + 881290.

It is an arithmetic number, because the mean of its divisors is an integer number (6460812288).

Almost surely, 2^213021878965 is an apocalyptic number.

It is an amenable number.

213021878965 is a deficient number, since it is larger than the sum of its proper divisors (97097110859).

213021878965 is a wasteful number, since it uses less digits than its factorization.

213021878965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289298 (or 289291 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 213021878965 in words is "two hundred thirteen billion, twenty-one million, eight hundred seventy-eight thousand, nine hundred sixty-five".