212013123731 has 2 divisors, whose sum is σ = 212013123732. Its totient is φ = 212013123730.

The previous prime is 212013123709. The next prime is 212013123787. The reversal of 212013123731 is 137321310212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212013123731 - 2¹⁸ = 212012861587 is a prime.

It is a super-2 number, since 2×212013123731² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212013123731.

It is not a weakly prime, because it can be changed into another prime (212013123331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006561865 + 106006561866.

It is an arithmetic number, because the mean of its divisors is an integer number (106006561866).

Almost surely, 2^212013123731 is an apocalyptic number.

212013123731 is a deficient number, since it is larger than the sum of its proper divisors (1).

212013123731 is an equidigital number, since it uses as much as digits as its factorization.

212013123731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 212013123731 its reverse (137321310212), we get a palindrome (349334433943).

The spelling of 212013123731 in words is "two hundred twelve billion, thirteen million, one hundred twenty-three thousand, seven hundred thirty-one".