21012201200220 has 24 divisors (see below), whose sum is σ = 58834163360784. Its totient is φ = 5603253653376.

The previous prime is 21012201200209. The next prime is 21012201200231. The reversal of 21012201200220 is 2200210221012.

It is an interprime number because it is at equal distance from previous prime (21012201200209) and next prime (21012201200231).

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 21012201200220.

It is a congruent number.

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, 175101676609 + ... + 175101676728.

It is an arithmetic number, because the mean of its divisors is an integer number (2451423473366).

Almost surely, 2^{21012201200220} is an apocalyptic number.

21012201200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012201200220 is an abundant number, since it is smaller than the sum of its proper divisors (37821962160564).

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

21012201200220 is a wasteful number, since it uses less digits than its factorization.

21012201200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350203353349 (or 350203353347 counting only the distinct ones).

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

Adding to 21012201200220 its reverse (2200210221012), we get a palindrome (23212411421232).

The spelling of 21012201200220 in words is "twenty-one trillion, twelve billion, two hundred one million, two hundred thousand, two hundred twenty".