213131100123 has 16 divisors (see below), whose sum is σ = 317513750400. Its totient is φ = 141293612520.

The previous prime is 213131100097. The next prime is 213131100131. The reversal of 213131100123 is 321001131312.

It is not a de Polignac number, because 213131100123 - 2⁶ = 213131100059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213131100096 and 213131100105.

It is not an unprimeable number, because it can be changed into a prime (213131102123) 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, 22044733 + ... + 22054398.

It is an arithmetic number, because the mean of its divisors is an integer number (19844609400).

Almost surely, 2^213131100123 is an apocalyptic number.

213131100123 is a deficient number, since it is larger than the sum of its proper divisors (104382650277).

213131100123 is a wasteful number, since it uses less digits than its factorization.

213131100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44099319 (or 44099313 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 213131100123 its reverse (321001131312), we get a palindrome (534132231435).

The spelling of 213131100123 in words is "two hundred thirteen billion, one hundred thirty-one million, one hundred thousand, one hundred twenty-three".