21891376835 has 8 divisors (see below), whose sum is σ = 26277807120. Its totient is φ = 17507664864.

The previous prime is 21891376781. The next prime is 21891376909. The reversal of 21891376835 is 53867319812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21891376835 is a prime.

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, 661817 + ... + 694106.

It is an arithmetic number, because the mean of its divisors is an integer number (3284725890).

Almost surely, 2^21891376835 is an apocalyptic number.

21891376835 is a deficient number, since it is larger than the sum of its proper divisors (4386430285).

21891376835 is a wasteful number, since it uses less digits than its factorization.

21891376835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359157.

The product of its digits is 2177280, while the sum is 53.

The spelling of 21891376835 in words is "twenty-one billion, eight hundred ninety-one million, three hundred seventy-six thousand, eight hundred thirty-five".