31603602421 has 2 divisors, whose sum is σ = 31603602422. Its totient is φ = 31603602420.

The previous prime is 31603602419. The next prime is 31603602439. The reversal of 31603602421 is 12420630613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31447702225 + 155900196 = 177335^2 + 12486^2 .

It is a cyclic number.

It is not a de Polignac number, because 31603602421 - 2¹ = 31603602419 is a prime.

It is a super-2 number, since 2×31603602421² (a number of 22 digits) contains 22 as substring.

Together with 31603602419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31603602421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31603602451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15801801210 + 15801801211.

It is an arithmetic number, because the mean of its divisors is an integer number (15801801211).

Almost surely, 2^31603602421 is an apocalyptic number.

It is an amenable number.

31603602421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31603602421 is an equidigital number, since it uses as much as digits as its factorization.

31603602421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 31603602421 in words is "thirty-one billion, six hundred three million, six hundred two thousand, four hundred twenty-one".