21454013402400 has 144 divisors (see below), whose sum is σ = 72240841915200. Its totient is φ = 5523791938560.

The previous prime is 21454013402399. The next prime is 21454013402417. The reversal of 21454013402400 is 420431045412.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 154054060 + ... + 154193259.

It is an arithmetic number, because the mean of its divisors is an integer number (501672513300).

Almost surely, 2^{21454013402400} is an apocalyptic number.

21454013402400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21454013402400 is an abundant number, since it is smaller than the sum of its proper divisors (50786828512800).

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

21454013402400 is a wasteful number, since it uses less digits than its factorization.

21454013402400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308247371 (or 308247358 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21454013402400 its reverse (420431045412), we get a palindrome (21874444447812).

The spelling of 21454013402400 in words is "twenty-one trillion, four hundred fifty-four billion, thirteen million, four hundred two thousand, four hundred".