210021220220 has 24 divisors (see below), whose sum is σ = 504050928864. Its totient is φ = 72007275456.

The previous prime is 210021220193. The next prime is 210021220229. The reversal of 210021220220 is 22022120012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 210021220195 and 210021220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021220229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750075647 + ... + 750075926.

It is an arithmetic number, because the mean of its divisors is an integer number (21002122036).

Almost surely, 2^210021220220 is an apocalyptic number.

210021220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021220220 is an abundant number, since it is smaller than the sum of its proper divisors (294029708644).

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

210021220220 is a wasteful number, since it uses less digits than its factorization.

210021220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500151589 (or 1500151587 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 210021220220 its reverse (22022120012), we get a palindrome (232043340232).

The spelling of 210021220220 in words is "two hundred ten billion, twenty-one million, two hundred twenty thousand, two hundred twenty".