21499735438 has 24 divisors (see below), whose sum is σ = 33728173416. Its totient is φ = 10277770800.

The previous prime is 21499735427. The next prime is 21499735451. The reversal of 21499735438 is 83453799412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3690568 + ... + 3696388.

It is an arithmetic number, because the mean of its divisors is an integer number (1405340559).

Almost surely, 2^21499735438 is an apocalyptic number.

21499735438 is a deficient number, since it is larger than the sum of its proper divisors (12228437978).

21499735438 is a wasteful number, since it uses less digits than its factorization.

21499735438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360 (or 9337 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 55.

The spelling of 21499735438 in words is "twenty-one billion, four hundred ninety-nine million, seven hundred thirty-five thousand, four hundred thirty-eight".