221210020020 has 96 divisors (see below), whose sum is σ = 680171175936. Its totient is φ = 53271504000.

The previous prime is 221210019949. The next prime is 221210020049. The reversal of 221210020020 is 20020012122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 221210019978 and 221210020005.

It is a congruent number.

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, 1010164 + ... + 1209483.

It is an arithmetic number, because the mean of its divisors is an integer number (7085116416).

Almost surely, 2^221210020020 is an apocalyptic number.

221210020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210020020 is an abundant number, since it is smaller than the sum of its proper divisors (458961155916).

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

221210020020 is a wasteful number, since it uses less digits than its factorization.

221210020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219821 (or 2219819 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 221210020020 its reverse (20020012122), we get a palindrome (241230032142).

The spelling of 221210020020 in words is "two hundred twenty-one billion, two hundred ten million, twenty thousand, twenty".