21001010212220 has 12 divisors (see below), whose sum is σ = 44102121445704. Its totient is φ = 8400404084880.

The previous prime is 21001010212211. The next prime is 21001010212271. The reversal of 21001010212220 is 2221201010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001010212195 and 21001010212204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525025255286 + ... + 525025255325.

It is an arithmetic number, because the mean of its divisors is an integer number (3675176787142).

Almost surely, 2^{21001010212220} is an apocalyptic number.

21001010212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001010212220 is an abundant number, since it is smaller than the sum of its proper divisors (23101111233484).

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

21001010212220 is a wasteful number, since it uses less digits than its factorization.

21001010212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050050510620 (or 1050050510618 counting only the distinct ones).

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

Adding to 21001010212220 its reverse (2221201010012), we get a palindrome (23222211222232).

The spelling of 21001010212220 in words is "twenty-one trillion, one billion, ten million, two hundred twelve thousand, two hundred twenty".