21422140400 has 60 divisors (see below), whose sum is σ = 51976361544. Its totient is φ = 8484000000.

The previous prime is 21422140393. The next prime is 21422140409. The reversal of 21422140400 is 404122412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422140409) 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 11 ways as a sum of consecutive naturals, for example, 224726 + ... + 305525.

Almost surely, 2^21422140400 is an apocalyptic number.

21422140400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21422140400 is an abundant number, since it is smaller than the sum of its proper divisors (30554221144).

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

21422140400 is a wasteful number, since it uses less digits than its factorization.

21422140400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530370 (or 530359 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21422140400 its reverse (404122412), we get a palindrome (21826262812).

The spelling of 21422140400 in words is "twenty-one billion, four hundred twenty-two million, one hundred forty thousand, four hundred".