213123021113031 has 4 divisors (see below), whose sum is σ = 284164028150712. Its totient is φ = 142082014075352.

The previous prime is 213123021113027. The next prime is 213123021113071. The reversal of 213123021113031 is 130311120321312.

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 213123021113031 - 2² = 213123021113027 is a prime.

It is a super-2 number, since 2×213123021113031² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213123021112992 and 213123021113010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123021113021) 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, 35520503518836 + ... + 35520503518841.

It is an arithmetic number, because the mean of its divisors is an integer number (71041007037678).

Almost surely, 2^{213123021113031} is an apocalyptic number.

213123021113031 is a deficient number, since it is larger than the sum of its proper divisors (71041007037681).

213123021113031 is an equidigital number, since it uses as much as digits as its factorization.

213123021113031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71041007037680.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 213123021113031 its reverse (130311120321312), we get a palindrome (343434141434343).

The spelling of 213123021113031 in words is "two hundred thirteen trillion, one hundred twenty-three billion, twenty-one million, one hundred thirteen thousand, thirty-one".