213650634021 has 16 divisors (see below), whose sum is σ = 311870495808. Its totient is φ = 129024425600.

The previous prime is 213650634017. The next prime is 213650634031. The reversal of 213650634021 is 120436056312.

It is a cyclic number.

It is not a de Polignac number, because 213650634021 - 2² = 213650634017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213650634031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11510766 + ... + 11529311.

It is an arithmetic number, because the mean of its divisors is an integer number (19491905988).

Almost surely, 2^213650634021 is an apocalyptic number.

It is an amenable number.

213650634021 is a deficient number, since it is larger than the sum of its proper divisors (98219861787).

213650634021 is a wasteful number, since it uses less digits than its factorization.

213650634021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23040372.

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 213650634021 in words is "two hundred thirteen billion, six hundred fifty million, six hundred thirty-four thousand, twenty-one".