31920102421 has 8 divisors (see below), whose sum is σ = 32671520960. Its totient is φ = 31177174752.

The previous prime is 31920102419. The next prime is 31920102439. The reversal of 31920102421 is 12420102913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31920102421 - 2¹ = 31920102419 is a prime.

It is a super-2 number, since 2×31920102421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31920102491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2115111 + ... + 2130148.

It is an arithmetic number, because the mean of its divisors is an integer number (4083940120).

Almost surely, 2^31920102421 is an apocalyptic number.

It is an amenable number.

31920102421 is a deficient number, since it is larger than the sum of its proper divisors (751418539).

31920102421 is a wasteful number, since it uses less digits than its factorization.

31920102421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245435.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 31920102421 in words is "thirty-one billion, nine hundred twenty million, one hundred two thousand, four hundred twenty-one".