21012222220000 has 240 divisors, whose sum is σ = 58211737081344. Its totient is φ = 7394328000000.

The previous prime is 21012222219949. The next prime is 21012222220019. The reversal of 21012222220000 is 2222221012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5279515 + ... + 8360485.

Almost surely, 2^{21012222220000} is an apocalyptic number.

21012222220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21012222220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29105868540672).

21012222220000 is an abundant number, since it is smaller than the sum of its proper divisors (37199514861344).

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

21012222220000 is a wasteful number, since it uses less digits than its factorization.

21012222220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081043 (or 3081020 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21012222220000 its reverse (2222221012), we get a palindrome (21014444441012).

The spelling of 21012222220000 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, two hundred twenty thousand".