21401032344 has 16 divisors (see below), whose sum is σ = 53502580920. Its totient is φ = 7133677440.

The previous prime is 21401032319. The next prime is 21401032421. The reversal of 21401032344 is 44323010412.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 891709681 = 21401032344 / (2 + 1 + 4 + 0 + 1 + 0 + 3 + 2 + 3 + 4 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445854817 + ... + 445854864.

Almost surely, 2^21401032344 is an apocalyptic number.

21401032344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21401032344 is an abundant number, since it is smaller than the sum of its proper divisors (32101548576).

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

21401032344 is a wasteful number, since it uses less digits than its factorization.

21401032344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891709690 (or 891709686 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21401032344 its reverse (44323010412), we get a palindrome (65724042756).

The spelling of 21401032344 in words is "twenty-one billion, four hundred one million, thirty-two thousand, three hundred forty-four".