221031120012 has 24 divisors (see below), whose sum is σ = 520746460416. Its totient is φ = 72961728528.

The previous prime is 221031120001. The next prime is 221031120049. The reversal of 221031120012 is 210021130122.

It is a junction number, because it is equal to n+sod(n) for n = 221031119973 and 221031120000.

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, 89412648 + ... + 89415119.

It is an arithmetic number, because the mean of its divisors is an integer number (21697769184).

Almost surely, 2^221031120012 is an apocalyptic number.

It is an amenable number.

221031120012 is an abundant number, since it is smaller than the sum of its proper divisors (299715340404).

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

221031120012 is a wasteful number, since it uses less digits than its factorization.

221031120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178827877 (or 178827875 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221031120012 its reverse (210021130122), we get a palindrome (431052250134).

The spelling of 221031120012 in words is "two hundred twenty-one billion, thirty-one million, one hundred twenty thousand, twelve".