21122021000220 has 192 divisors, whose sum is σ = 70918853031936. Its totient is φ = 4592468136960.

The previous prime is 21122021000209. The next prime is 21122021000221. The reversal of 21122021000220 is 2200012022112.

It is a super-2 number, since 2×21122021000220² (a number of 27 digits) contains 22 as substring.

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 21122021000220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122021000221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4291719 + ... + 7788638.

It is an arithmetic number, because the mean of its divisors is an integer number (369369026208).

Almost surely, 2^{21122021000220} is an apocalyptic number.

21122021000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122021000220 is an abundant number, since it is smaller than the sum of its proper divisors (49796832031716).

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

21122021000220 is a wasteful number, since it uses less digits than its factorization.

21122021000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12080580 (or 12080578 counting only the distinct ones).

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

Adding to 21122021000220 its reverse (2200012022112), we get a palindrome (23322033022332).

The spelling of 21122021000220 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred twenty", and thus it is an aban number.