21874693687 has 8 divisors (see below), whose sum is σ = 27272345472. Its totient is φ = 17045215800.

The previous prime is 21874693681. The next prime is 21874693723. The reversal of 21874693687 is 78639647812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21874693687 - 2¹⁵ = 21874660919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21874693681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142043389 + ... + 142043542.

It is an arithmetic number, because the mean of its divisors is an integer number (3409043184).

Almost surely, 2^21874693687 is an apocalyptic number.

21874693687 is a deficient number, since it is larger than the sum of its proper divisors (5397651785).

21874693687 is a wasteful number, since it uses less digits than its factorization.

21874693687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284086949.

The product of its digits is 24385536, while the sum is 61.

The spelling of 21874693687 in words is "twenty-one billion, eight hundred seventy-four million, six hundred ninety-three thousand, six hundred eighty-seven".