21122200120020 has 24 divisors (see below), whose sum is σ = 59142160336224. Its totient is φ = 5632586698656.

The previous prime is 21122200119971. The next prime is 21122200120081. The reversal of 21122200120020 is 2002100222112.

It is a super-2 number, since 2×21122200120020² (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 congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176018334274 + ... + 176018334393.

It is an arithmetic number, because the mean of its divisors is an integer number (2464256680676).

Almost surely, 2^{21122200120020} is an apocalyptic number.

21122200120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122200120020 is an abundant number, since it is smaller than the sum of its proper divisors (38019960216204).

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

21122200120020 is a wasteful number, since it uses less digits than its factorization.

21122200120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352036668679 (or 352036668677 counting only the distinct ones).

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

Adding to 21122200120020 its reverse (2002100222112), we get a palindrome (23124300342132).

The spelling of 21122200120020 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred million, one hundred twenty thousand, twenty".