213012210021 has 16 divisors (see below), whose sum is σ = 305947849536. Its totient is φ = 131048366976.

The previous prime is 213012209989. The next prime is 213012210049. The reversal of 213012210021 is 120012210312.

It is not a de Polignac number, because 213012210021 - 2⁵ = 213012209989 is a prime.

It is a super-2 number, since 2×213012210021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213012220021) 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, 607560 + ... + 891713.

It is an arithmetic number, because the mean of its divisors is an integer number (19121740596).

Almost surely, 2^213012210021 is an apocalyptic number.

It is an amenable number.

213012210021 is a deficient number, since it is larger than the sum of its proper divisors (92935639515).

213012210021 is a wasteful number, since it uses less digits than its factorization.

213012210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502932.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 213012210021 its reverse (120012210312), we get a palindrome (333024420333).

It can be divided in two parts, 21301 and 2210021, that added together give a palindrome (2231322).

The spelling of 213012210021 in words is "two hundred thirteen billion, twelve million, two hundred ten thousand, twenty-one".