31221241420 has 24 divisors (see below), whose sum is σ = 67679595648. Its totient is φ = 12085641600.

The previous prime is 31221241367. The next prime is 31221241433. The reversal of 31221241420 is 2414212213.

It is a junction number, because it is equal to n+sod(n) for n = 31221241391 and 31221241400.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25177801 + ... + 25179040.

It is an arithmetic number, because the mean of its divisors is an integer number (2819983152).

Almost surely, 2^31221241420 is an apocalyptic number.

It is an amenable number.

31221241420 is an abundant number, since it is smaller than the sum of its proper divisors (36458354228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221241420 is a wasteful number, since it uses less digits than its factorization.

31221241420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50356881 (or 50356879 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 31221241420 its reverse (2414212213), we get a palindrome (33635453633).

The spelling of 31221241420 in words is "thirty-one billion, two hundred twenty-one million, two hundred forty-one thousand, four hundred twenty".