21321145827400 has 48 divisors (see below), whose sum is σ = 50052942388800. Its totient is φ = 8445657756480.

The previous prime is 21321145827361. The next prime is 21321145827403. The reversal of 21321145827400 is 472854112312.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (21321145827403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 517482940 + ... + 517524139.

It is an arithmetic number, because the mean of its divisors is an integer number (1042769633100).

Almost surely, 2^{21321145827400} is an apocalyptic number.

21321145827400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321145827400 is an abundant number, since it is smaller than the sum of its proper divisors (28731796561400).

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

21321145827400 is a wasteful number, since it uses less digits than its factorization.

21321145827400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035007198 (or 1035007189 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

Adding to 21321145827400 its reverse (472854112312), we get a palindrome (21793999939712).

The spelling of 21321145827400 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred forty-five million, eight hundred twenty-seven thousand, four hundred".