21204755311 has 8 divisors (see below), whose sum is σ = 21938108400. Its totient is φ = 20471545920.

The previous prime is 21204755287. The next prime is 21204755339. The reversal of 21204755311 is 11355740212.

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 21204755311 - 2¹⁷ = 21204624239 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 (21204755371) 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, 326380 + ... + 385918.

It is an arithmetic number, because the mean of its divisors is an integer number (2742263550).

Almost surely, 2^21204755311 is an apocalyptic number.

21204755311 is a deficient number, since it is larger than the sum of its proper divisors (733353089).

21204755311 is a wasteful number, since it uses less digits than its factorization.

21204755311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71849.

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 21204755311 in words is "twenty-one billion, two hundred four million, seven hundred fifty-five thousand, three hundred eleven".