21222210202020 has 96 divisors (see below), whose sum is σ = 67560111104640. Its totient is φ = 5527645441920.

The previous prime is 21222210202007. The next prime is 21222210202033. The reversal of 21222210202020 is 2020201222212.

21222210202020 is a `hidden beast` number, since 212 + 22 + 210 + 20 + 202 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21222210202007) and next prime (21222210202033).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21222210201984 and 21222210202002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 456958051 + ... + 457004490.

It is an arithmetic number, because the mean of its divisors is an integer number (703751157340).

Almost surely, 2^{21222210202020} is an apocalyptic number.

21222210202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222210202020 is an abundant number, since it is smaller than the sum of its proper divisors (46337900902620).

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

21222210202020 is a wasteful number, since it uses less digits than its factorization.

21222210202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913962602 (or 913962594 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222210202020 its reverse (2020201222212), we get a palindrome (23242411424232).

The spelling of 21222210202020 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, two hundred two thousand, twenty".