21342235400 has 24 divisors (see below), whose sum is σ = 49620697770. Its totient is φ = 8536894080.

The previous prime is 21342235381. The next prime is 21342235403. The reversal of 21342235400 is 453224312.

It can be written as a sum of positive squares in 3 ways, for example, as 19870285444 + 1471949956 = 140962^2 + 38366^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21342235400.

It is not an unprimeable number, because it can be changed into a prime (21342235403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53355389 + ... + 53355788.

Almost surely, 2^21342235400 is an apocalyptic number.

21342235400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21342235400 is an abundant number, since it is smaller than the sum of its proper divisors (28278462370).

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

21342235400 is a wasteful number, since it uses less digits than its factorization.

21342235400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106711193 (or 106711184 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21342235400 its reverse (453224312), we get a palindrome (21795459712).

The spelling of 21342235400 in words is "twenty-one billion, three hundred forty-two million, two hundred thirty-five thousand, four hundred".