21454421400 has 144 divisors (see below), whose sum is σ = 74719827000. Its totient is φ = 5721166080.

The previous prime is 21454421393. The next prime is 21454421407. The reversal of 21454421400 is 412445412.

21454421400 is a `hidden beast` number, since 214 + 5 + 4 + 42 + 1 + 400 = 666.

It is an interprime number because it is at equal distance from previous prime (21454421393) and next prime (21454421407).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454421407) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 172125 + ... + 269324.

Almost surely, 2^21454421400 is an apocalyptic number.

21454421400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21454421400 is an abundant number, since it is smaller than the sum of its proper divisors (53265405600).

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

21454421400 is a wasteful number, since it uses less digits than its factorization.

21454421400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441480 (or 441459 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 21454421400 its reverse (412445412), we get a palindrome (21866866812).

The spelling of 21454421400 in words is "twenty-one billion, four hundred fifty-four million, four hundred twenty-one thousand, four hundred".