31220424200421 has 16 divisors (see below), whose sum is σ = 46252677643200. Its totient is φ = 20813527327824.

The previous prime is 31220424200419. The next prime is 31220424200437. The reversal of 31220424200421 is 12400242402213.

It is a happy number.

31220424200421 is a `hidden beast` number, since 3 + 12 + 2 + 0 + 4 + 24 + 200 + 421 = 666.

It is not a de Polignac number, because 31220424200421 - 2¹ = 31220424200419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220424200461) 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, 4317670 + ... + 9004616.

It is an arithmetic number, because the mean of its divisors is an integer number (2890792352700).

Almost surely, 2^{31220424200421} is an apocalyptic number.

It is an amenable number.

31220424200421 is a deficient number, since it is larger than the sum of its proper divisors (15032253442779).

31220424200421 is a wasteful number, since it uses less digits than its factorization.

31220424200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933665 (or 4933659 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 31220424200421 its reverse (12400242402213), we get a palindrome (43620666602634).

The spelling of 31220424200421 in words is "thirty-one trillion, two hundred twenty billion, four hundred twenty-four million, two hundred thousand, four hundred twenty-one".