21421211020000 has 120 divisors (see below), whose sum is σ = 57490246725912. Its totient is φ = 7789531200000.

The previous prime is 21421211019991. The next prime is 21421211020003. The reversal of 21421211020000 is 2011212412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421211020003) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 48464571 + ... + 48904570.

Almost surely, 2^{21421211020000} is an apocalyptic number.

21421211020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421211020000 is an abundant number, since it is smaller than the sum of its proper divisors (36069035705912).

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

21421211020000 is an equidigital number, since it uses as much as digits as its factorization.

21421211020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97369182 (or 97369159 counting only the distinct ones).

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

Adding to 21421211020000 its reverse (2011212412), we get a palindrome (21423222232412).

The spelling of 21421211020000 in words is "twenty-one trillion, four hundred twenty-one billion, two hundred eleven million, twenty thousand".