21344322400 has 36 divisors (see below), whose sum is σ = 52106829012. Its totient is φ = 8537728640.

The previous prime is 21344322367. The next prime is 21344322407. The reversal of 21344322400 is 422344312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344322407) 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, 13339402 + ... + 13341001.

It is an arithmetic number, because the mean of its divisors is an integer number (1447411917).

Almost surely, 2^21344322400 is an apocalyptic number.

21344322400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344322400 is an abundant number, since it is smaller than the sum of its proper divisors (30762506612).

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

21344322400 is a wasteful number, since it uses less digits than its factorization.

21344322400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26680423 (or 26680410 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21344322400 its reverse (422344312), we get a palindrome (21766666712).

The spelling of 21344322400 in words is "twenty-one billion, three hundred forty-four million, three hundred twenty-two thousand, four hundred".