21123011200220 has 48 divisors (see below), whose sum is σ = 44935492029120. Its totient is φ = 8339857099776.

The previous prime is 21123011200189. The next prime is 21123011200271. The reversal of 21123011200220 is 2200211032112.

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, 17847677 + ... + 18994356.

It is an arithmetic number, because the mean of its divisors is an integer number (936156083940).

Almost surely, 2^{21123011200220} is an apocalyptic number.

21123011200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123011200220 is an abundant number, since it is smaller than the sum of its proper divisors (23812480828900).

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

21123011200220 is a wasteful number, since it uses less digits than its factorization.

21123011200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36842414 (or 36842412 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21123011200220 its reverse (2200211032112), we get a palindrome (23323222232332).

The spelling of 21123011200220 in words is "twenty-one trillion, one hundred twenty-three billion, eleven million, two hundred thousand, two hundred twenty".