213021102131 has 4 divisors (see below), whose sum is σ = 213278685912. Its totient is φ = 212763518352.

The previous prime is 213021102121. The next prime is 213021102137. The reversal of 213021102131 is 131201120312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213021102131 - 2⁶ = 213021102067 is a prime.

It is a super-2 number, since 2×213021102131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213021102137) 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, 128790650 + ... + 128792303.

It is an arithmetic number, because the mean of its divisors is an integer number (53319671478).

Almost surely, 2^213021102131 is an apocalyptic number.

213021102131 is a deficient number, since it is larger than the sum of its proper divisors (257583781).

213021102131 is an equidigital number, since it uses as much as digits as its factorization.

213021102131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257583780.

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

Adding to 213021102131 its reverse (131201120312), we get a palindrome (344222222443).

The spelling of 213021102131 in words is "two hundred thirteen billion, twenty-one million, one hundred two thousand, one hundred thirty-one".