21112221202000 has 80 divisors (see below), whose sum is σ = 51055296394752. Its totient is φ = 8443904937600.

The previous prime is 21112221201997. The next prime is 21112221202021. The reversal of 21112221202000 is 20212221112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 16683609 + ... + 17904391.

Almost surely, 2^{21112221202000} is an apocalyptic number.

21112221202000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112221202000 is an abundant number, since it is smaller than the sum of its proper divisors (29943075192752).

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

21112221202000 is a wasteful number, since it uses less digits than its factorization.

21112221202000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229453 (or 1229437 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112221202000 its reverse (20212221112), we get a palindrome (21132433423112).

The spelling of 21112221202000 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, two hundred two thousand".