31421335621 has 16 divisors (see below), whose sum is σ = 35622107136. Its totient is φ = 27497707776.

The previous prime is 31421335597. The next prime is 31421335651. The reversal of 31421335621 is 12653312413.

It is not a de Polignac number, because 31421335621 - 2¹⁵ = 31421302853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421335651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431205 + ... + 498778.

It is an arithmetic number, because the mean of its divisors is an integer number (2226381696).

Almost surely, 2^31421335621 is an apocalyptic number.

It is an amenable number.

31421335621 is a deficient number, since it is larger than the sum of its proper divisors (4200771515).

31421335621 is a wasteful number, since it uses less digits than its factorization.

31421335621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930132.

The product of its digits is 12960, while the sum is 31.

The spelling of 31421335621 in words is "thirty-one billion, four hundred twenty-one million, three hundred thirty-five thousand, six hundred twenty-one".