21021201202000 has 160 divisors (see below), whose sum is σ = 51145323989760. Its totient is φ = 8356356953600.

The previous prime is 21021201201983. The next prime is 21021201202033. The reversal of 21021201202000 is 20210212012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210324039 + ... + 210423961.

It is an arithmetic number, because the mean of its divisors is an integer number (319658274936).

Almost surely, 2^{21021201202000} is an apocalyptic number.

21021201202000 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 21021201202000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25572661994880).

21021201202000 is an abundant number, since it is smaller than the sum of its proper divisors (30124122787760).

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

21021201202000 is a wasteful number, since it uses less digits than its factorization.

21021201202000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100598 (or 100582 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21021201202000 its reverse (20210212012), we get a palindrome (21041411414012).

The spelling of 21021201202000 in words is "twenty-one trillion, twenty-one billion, two hundred one million, two hundred two thousand".