31200421381 has 2 divisors, whose sum is σ = 31200421382. Its totient is φ = 31200421380.

The previous prime is 31200421327. The next prime is 31200421387. The reversal of 31200421381 is 18312400213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19978409025 + 11222012356 = 141345^2 + 105934^2 .

It is a cyclic number.

It is not a de Polignac number, because 31200421381 - 2⁷ = 31200421253 is a prime.

It is a super-2 number, since 2×31200421381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31200421387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600210690 + 15600210691.

It is an arithmetic number, because the mean of its divisors is an integer number (15600210691).

Almost surely, 2^31200421381 is an apocalyptic number.

It is an amenable number.

31200421381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31200421381 is an equidigital number, since it uses as much as digits as its factorization.

31200421381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 31200421381 its reverse (18312400213), we get a palindrome (49512821594).

The spelling of 31200421381 in words is "thirty-one billion, two hundred million, four hundred twenty-one thousand, three hundred eighty-one".