221312202020 has 96 divisors (see below), whose sum is σ = 575651021568. Its totient is φ = 69595448832.

The previous prime is 221312201963. The next prime is 221312202049. The reversal of 221312202020 is 20202213122.

It is a self number, because there is not a number n which added to its sum of digits gives 221312202020.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101522 + ... + 673001.

It is an arithmetic number, because the mean of its divisors is an integer number (5996364808).

Almost surely, 2^221312202020 is an apocalyptic number.

221312202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221312202020 is an abundant number, since it is smaller than the sum of its proper divisors (354338819548).

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

221312202020 is a wasteful number, since it uses less digits than its factorization.

221312202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774709 (or 774707 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 221312202020 its reverse (20202213122), we get a palindrome (241514415142).

The spelling of 221312202020 in words is "two hundred twenty-one billion, three hundred twelve million, two hundred two thousand, twenty".