21351754811 has 8 divisors (see below), whose sum is σ = 22792089600. Its totient is φ = 19943075880.

The previous prime is 21351754789. The next prime is 21351754817. The reversal of 21351754811 is 11845715312.

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-21351754811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21351754817) 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, 7912571 + ... + 7915268.

It is an arithmetic number, because the mean of its divisors is an integer number (2849011200).

Almost surely, 2^21351754811 is an apocalyptic number.

21351754811 is a deficient number, since it is larger than the sum of its proper divisors (1440334789).

21351754811 is a wasteful number, since it uses less digits than its factorization.

21351754811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15827929.

The product of its digits is 33600, while the sum is 38.

The spelling of 21351754811 in words is "twenty-one billion, three hundred fifty-one million, seven hundred fifty-four thousand, eight hundred eleven".