21012220220000 has 60 divisors (see below), whose sum is σ = 51693213623436. Its totient is φ = 8404888080000.

The previous prime is 21012220219967. The next prime is 21012220220009. The reversal of 21012220220000 is 2202221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012220220009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 525285506 + ... + 525325505.

Almost surely, 2^{21012220220000} is an apocalyptic number.

21012220220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012220220000 is an abundant number, since it is smaller than the sum of its proper divisors (30680993403436).

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

21012220220000 is an equidigital number, since it uses as much as digits as its factorization.

21012220220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050611041 (or 1050611018 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21012220220000 its reverse (2202221012), we get a palindrome (21014422441012).

The spelling of 21012220220000 in words is "twenty-one trillion, twelve billion, two hundred twenty million, two hundred twenty thousand".