21200010210220 has 24 divisors (see below), whose sum is σ = 44520127417584. Its totient is φ = 8479983898176.

The previous prime is 21200010210167. The next prime is 21200010210251. The reversal of 21200010210220 is 2201201000212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21200010210220.

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, 9653667 + ... + 11644453.

It is an arithmetic number, because the mean of its divisors is an integer number (1855005309066).

Almost surely, 2^{21200010210220} is an apocalyptic number.

21200010210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200010210220 is an abundant number, since it is smaller than the sum of its proper divisors (23320117207364).

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

21200010210220 is a wasteful number, since it uses less digits than its factorization.

21200010210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523249 (or 2523247 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21200010210220 its reverse (2201201000212), we get a palindrome (23401211210432).

The spelling of 21200010210220 in words is "twenty-one trillion, two hundred billion, ten million, two hundred ten thousand, two hundred twenty".