21101010220220 has 48 divisors (see below), whose sum is σ = 51719922938880. Its totient is φ = 7080703731264.

The previous prime is 21101010220211. The next prime is 21101010220229. The reversal of 21101010220220 is 2202201010112.

It is an interprime number because it is at equal distance from previous prime (21101010220211) and next prime (21101010220229).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21101010220195 and 21101010220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101010220229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1603413650 + ... + 1603426809.

It is an arithmetic number, because the mean of its divisors is an integer number (1077498394560).

Almost surely, 2^{21101010220220} is an apocalyptic number.

21101010220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101010220220 is an abundant number, since it is smaller than the sum of its proper divisors (30618912718660).

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

21101010220220 is a wasteful number, since it uses less digits than its factorization.

21101010220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206840522 (or 3206840520 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21101010220220 its reverse (2202201010112), we get a palindrome (23303211230332).

The spelling of 21101010220220 in words is "twenty-one trillion, one hundred one billion, ten million, two hundred twenty thousand, two hundred twenty".