221200210120020 has 48 divisors (see below), whose sum is σ = 621198453640128. Its totient is φ = 58811687907840.

The previous prime is 221200210119979. The next prime is 221200210120051. The reversal of 221200210120020 is 20021012002122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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, 5469816826 + ... + 5469857265.

It is an arithmetic number, because the mean of its divisors is an integer number (12941634450836).

Almost surely, 2^{221200210120020} is an apocalyptic number.

221200210120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200210120020 is an abundant number, since it is smaller than the sum of its proper divisors (399998243520108).

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

221200210120020 is a wasteful number, since it uses less digits than its factorization.

221200210120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10939674440 (or 10939674438 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221200210120020 its reverse (20021012002122), we get a palindrome (241221222122142).

The spelling of 221200210120020 in words is "two hundred twenty-one trillion, two hundred billion, two hundred ten million, one hundred twenty thousand, twenty".