21160550311 has 4 divisors (see below), whose sum is σ = 21221532072. Its totient is φ = 21099568552.

The previous prime is 21160550309. The next prime is 21160550381. The reversal of 21160550311 is 11305506112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21160550311 - 2¹ = 21160550309 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 (21160550381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30490360 + ... + 30491053.

It is an arithmetic number, because the mean of its divisors is an integer number (5305383018).

Almost surely, 2^21160550311 is an apocalyptic number.

21160550311 is a deficient number, since it is larger than the sum of its proper divisors (60981761).

21160550311 is an equidigital number, since it uses as much as digits as its factorization.

21160550311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60981760.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 21160550311 in words is "twenty-one billion, one hundred sixty million, five hundred fifty thousand, three hundred eleven".