212013311021 has 4 divisors (see below), whose sum is σ = 212036641344. Its totient is φ = 211989980700.

The previous prime is 212013311009. The next prime is 212013311039. The reversal of 212013311021 is 120113310212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212013311021 - 2³⁴ = 194833441837 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 (212013310021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11651525 + ... + 11669706.

It is an arithmetic number, because the mean of its divisors is an integer number (53009160336).

Almost surely, 2^212013311021 is an apocalyptic number.

It is an amenable number.

212013311021 is a deficient number, since it is larger than the sum of its proper divisors (23330323).

212013311021 is an equidigital number, since it uses as much as digits as its factorization.

212013311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23330322.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 212013311021 its reverse (120113310212), we get a palindrome (332126621233).

The spelling of 212013311021 in words is "two hundred twelve billion, thirteen million, three hundred eleven thousand, twenty-one".