210021100220220 has 48 divisors (see below), whose sum is σ = 588059710318080. Its totient is φ = 56005566753856.

The previous prime is 210021100220219. The next prime is 210021100220257. The reversal of 210021100220220 is 22022001120012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 210021100220220.

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, 104898649 + ... + 106882031.

It is an arithmetic number, because the mean of its divisors is an integer number (12251243964960).

Almost surely, 2^{210021100220220} is an apocalyptic number.

210021100220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021100220220 is an abundant number, since it is smaller than the sum of its proper divisors (378038610097860).

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

210021100220220 is a wasteful number, since it uses less digits than its factorization.

210021100220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748234 (or 3748232 counting only the distinct ones).

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

Adding to 210021100220220 its reverse (22022001120012), we get a palindrome (232043101340232).

The spelling of 210021100220220 in words is "two hundred ten trillion, twenty-one billion, one hundred million, two hundred twenty thousand, two hundred twenty".