21751342365 has 8 divisors (see below), whose sum is σ = 34802147808. Its totient is φ = 11600715920.

The previous prime is 21751342337. The next prime is 21751342373. The reversal of 21751342365 is 56324315712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21751342365 - 2¹⁵ = 21751309597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725044731 + ... + 725044760.

It is an arithmetic number, because the mean of its divisors is an integer number (4350268476).

Almost surely, 2^21751342365 is an apocalyptic number.

It is an amenable number.

21751342365 is a deficient number, since it is larger than the sum of its proper divisors (13050805443).

21751342365 is a wasteful number, since it uses less digits than its factorization.

21751342365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450089499.

The product of its digits is 151200, while the sum is 39.

The spelling of 21751342365 in words is "twenty-one billion, seven hundred fifty-one million, three hundred forty-two thousand, three hundred sixty-five".