221020011020 has 24 divisors (see below), whose sum is σ = 464152567200. Its totient is φ = 88405996032.

The previous prime is 221020010993. The next prime is 221020011049. The reversal of 221020011020 is 20110020122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221020010992 and 221020011010.

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, 1041521 + ... + 1235639.

It is an arithmetic number, because the mean of its divisors is an integer number (19339690300).

Almost surely, 2^221020011020 is an apocalyptic number.

221020011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020011020 is an abundant number, since it is smaller than the sum of its proper divisors (243132556180).

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

221020011020 is a wasteful number, since it uses less digits than its factorization.

221020011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251057 (or 251055 counting only the distinct ones).

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

Adding to 221020011020 its reverse (20110020122), we get a palindrome (241130031142).

The spelling of 221020011020 in words is "two hundred twenty-one billion, twenty million, eleven thousand, twenty".