31319856421 has 8 divisors (see below), whose sum is σ = 37028401920. Its totient is φ = 25919881008.

The previous prime is 31319856413. The next prime is 31319856433. The reversal of 31319856421 is 12465891313.

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

It is not a de Polignac number, because 31319856421 - 2³ = 31319856413 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 (31319853421) 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, 77142301 + ... + 77142706.

It is an arithmetic number, because the mean of its divisors is an integer number (4628550240).

Almost surely, 2^31319856421 is an apocalyptic number.

It is an amenable number.

31319856421 is a deficient number, since it is larger than the sum of its proper divisors (5708545499).

31319856421 is a wasteful number, since it uses less digits than its factorization.

31319856421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154285043.

The product of its digits is 155520, while the sum is 43.

The spelling of 31319856421 in words is "thirty-one billion, three hundred nineteen million, eight hundred fifty-six thousand, four hundred twenty-one".