21927390211 has 16 divisors (see below), whose sum is σ = 24445532160. Its totient is φ = 19546289280.

The previous prime is 21927390203. The next prime is 21927390217. The reversal of 21927390211 is 11209372912.

It is a cyclic number.

It is not a de Polignac number, because 21927390211 - 2³ = 21927390203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21927390217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1838710 + ... + 1850596.

It is an arithmetic number, because the mean of its divisors is an integer number (1527845760).

Almost surely, 2^21927390211 is an apocalyptic number.

21927390211 is a deficient number, since it is larger than the sum of its proper divisors (2518141949).

21927390211 is a wasteful number, since it uses less digits than its factorization.

21927390211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17634.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 21927390211 in words is "twenty-one billion, nine hundred twenty-seven million, three hundred ninety thousand, two hundred eleven".