21873257011 has 6 divisors (see below), whose sum is σ = 22139972300. Its totient is φ = 21609716988.

The previous prime is 21873256991. The next prime is 21873257017. The reversal of 21873257011 is 11075237812.

It is not a de Polignac number, because 21873257011 - 2¹⁹ = 21872732723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21873257017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1580661 + ... + 1594438.

Almost surely, 2^21873257011 is an apocalyptic number.

21873257011 is a deficient number, since it is larger than the sum of its proper divisors (266715289).

21873257011 is an frugal number, since it uses more digits than its factorization.

21873257011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3175265 (or 3175182 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 37.

The spelling of 21873257011 in words is "twenty-one billion, eight hundred seventy-three million, two hundred fifty-seven thousand, eleven".