21442402400 has 72 divisors (see below), whose sum is σ = 54034916544. Its totient is φ = 8300275200.

The previous prime is 21442402381. The next prime is 21442402427. The reversal of 21442402400 is 420424412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407507 + ... + 457106.

It is an arithmetic number, because the mean of its divisors is an integer number (750484952).

Almost surely, 2^21442402400 is an apocalyptic number.

21442402400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21442402400 is an abundant number, since it is smaller than the sum of its proper divisors (32592514144).

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

21442402400 is a wasteful number, since it uses less digits than its factorization.

21442402400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864664 (or 864651 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 21442402400 its reverse (420424412), we get a palindrome (21862826812).

The spelling of 21442402400 in words is "twenty-one billion, four hundred forty-two million, four hundred two thousand, four hundred".