31220501421 has 8 divisors (see below), whose sum is σ = 41628368704. Its totient is φ = 20813150880.

The previous prime is 31220501387. The next prime is 31220501423. The reversal of 31220501421 is 12410502213.

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

It is not a de Polignac number, because 31220501421 - 2⁷ = 31220501293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220501423) 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, 45561 + ... + 254001.

It is an arithmetic number, because the mean of its divisors is an integer number (5203546088).

Almost surely, 2^31220501421 is an apocalyptic number.

It is an amenable number.

31220501421 is a deficient number, since it is larger than the sum of its proper divisors (10407867283).

31220501421 is a wasteful number, since it uses less digits than its factorization.

31220501421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258371.

The product of its (nonzero) digits is 480, while the sum is 21.

The spelling of 31220501421 in words is "thirty-one billion, two hundred twenty million, five hundred one thousand, four hundred twenty-one".