213132213021 has 16 divisors (see below), whose sum is σ = 349755426944. Its totient is φ = 112421386944.

The previous prime is 213132212981. The next prime is 213132213023. The reversal of 213132213021 is 120312231312.

It is not a de Polignac number, because 213132213021 - 2⁶ = 213132212957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213132213023) 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, 390351766 + ... + 390352311.

It is an arithmetic number, because the mean of its divisors is an integer number (21859714184).

Almost surely, 2^213132213021 is an apocalyptic number.

213132213021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213132213021 is a deficient number, since it is larger than the sum of its proper divisors (136623213923).

213132213021 is a wasteful number, since it uses less digits than its factorization.

213132213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780704100.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 213132213021 its reverse (120312231312), we get a palindrome (333444444333).

The spelling of 213132213021 in words is "two hundred thirteen billion, one hundred thirty-two million, two hundred thirteen thousand, twenty-one".