21122221011020 has 48 divisors (see below), whose sum is σ = 45451481939136. Its totient is φ = 8240469120000.

The previous prime is 21122221010981. The next prime is 21122221011029. The reversal of 21122221011020 is 2011012222112.

It is a super-2 number, since 2×21122221011020² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122221011020.

It is not an unprimeable number, because it can be changed into a prime (21122221011029) 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, 789281 + ... + 6547320.

It is an arithmetic number, because the mean of its divisors is an integer number (946905873732).

Almost surely, 2^{21122221011020} is an apocalyptic number.

21122221011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122221011020 is an abundant number, since it is smaller than the sum of its proper divisors (24329260928116).

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

21122221011020 is a wasteful number, since it uses less digits than its factorization.

21122221011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7340162 (or 7340160 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21122221011020 its reverse (2011012222112), we get a palindrome (23133233233132).

The spelling of 21122221011020 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-one million, eleven thousand, twenty".