21012001102220 has 24 divisors (see below), whose sum is σ = 44125742446800. Its totient is φ = 8404697558592.

The previous prime is 21012001102187. The next prime is 21012001102237. The reversal of 21012001102220 is 2220110021012.

It is a junction number, because it is equal to n+sod(n) for n = 21012001102195 and 21012001102204.

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, 4744655 + ... + 8033414.

It is an arithmetic number, because the mean of its divisors is an integer number (1838572601950).

Almost surely, 2^{21012001102220} is an apocalyptic number.

21012001102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012001102220 is an abundant number, since it is smaller than the sum of its proper divisors (23113741344580).

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

21012001102220 is a wasteful number, since it uses less digits than its factorization.

21012001102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12860297 (or 12860295 counting only the distinct ones).

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

Adding to 21012001102220 its reverse (2220110021012), we get a palindrome (23232111123232).

The spelling of 21012001102220 in words is "twenty-one trillion, twelve billion, one million, one hundred two thousand, two hundred twenty".