421251611731 has 2 divisors, whose sum is σ = 421251611732. Its totient is φ = 421251611730.

The previous prime is 421251611717. The next prime is 421251611743. The reversal of 421251611731 is 137116152124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421251611731 - 2¹⁵ = 421251578963 is a prime.

It is a super-2 number, since 2×421251611731² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421251411731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210625805865 + 210625805866.

It is an arithmetic number, because the mean of its divisors is an integer number (210625805866).

Almost surely, 2^421251611731 is an apocalyptic number.

421251611731 is a deficient number, since it is larger than the sum of its proper divisors (1).

421251611731 is an equidigital number, since it uses as much as digits as its factorization.

421251611731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

Adding to 421251611731 its reverse (137116152124), we get a palindrome (558367763855).

The spelling of 421251611731 in words is "four hundred twenty-one billion, two hundred fifty-one million, six hundred eleven thousand, seven hundred thirty-one".