21132020221400 has 96 divisors (see below), whose sum is σ = 56419460798400. Its totient is φ = 7279930396800.

The previous prime is 21132020221349. The next prime is 21132020221421. The reversal of 21132020221400 is 412202023112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 252733562 + ... + 252817161.

It is an arithmetic number, because the mean of its divisors is an integer number (587702716650).

Almost surely, 2^{21132020221400} is an apocalyptic number.

21132020221400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21132020221400 is an abundant number, since it is smaller than the sum of its proper divisors (35287440577000).

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

21132020221400 is a wasteful number, since it uses less digits than its factorization.

21132020221400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505550769 (or 505550760 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21132020221400 its reverse (412202023112), we get a palindrome (21544222244512).

The spelling of 21132020221400 in words is "twenty-one trillion, one hundred thirty-two billion, twenty million, two hundred twenty-one thousand, four hundred".