221002011020 has 48 divisors (see below), whose sum is σ = 533153103168. Its totient is φ = 75379507200.

The previous prime is 221002011011. The next prime is 221002011031. The reversal of 221002011020 is 20110200122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221002010992 and 221002011010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4062581 + ... + 4116620.

It is an arithmetic number, because the mean of its divisors is an integer number (11107356316).

Almost surely, 2^221002011020 is an apocalyptic number.

221002011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221002011020 is an abundant number, since it is smaller than the sum of its proper divisors (312151092148).

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

221002011020 is a wasteful number, since it uses less digits than its factorization.

221002011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8179410 (or 8179408 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221002011020 its reverse (20110200122), we get a palindrome (241112211142).

The spelling of 221002011020 in words is "two hundred twenty-one billion, two million, eleven thousand, twenty".