21233163877 has 4 divisors (see below), whose sum is σ = 21296170636. Its totient is φ = 21170157120.

The previous prime is 21233163869. The next prime is 21233163881. The reversal of 21233163877 is 77836133212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14574767076 + 6658396801 = 120726^2 + 81599^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233163877 - 2³ = 21233163869 is a prime.

It is a super-2 number, since 2×21233163877² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233163977) 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, 31502874 + ... + 31503547.

It is an arithmetic number, because the mean of its divisors is an integer number (5324042659).

Almost surely, 2^21233163877 is an apocalyptic number.

It is an amenable number.

21233163877 is a deficient number, since it is larger than the sum of its proper divisors (63006759).

21233163877 is an equidigital number, since it uses as much as digits as its factorization.

21233163877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63006758.

The product of its digits is 254016, while the sum is 43.

The spelling of 21233163877 in words is "twenty-one billion, two hundred thirty-three million, one hundred sixty-three thousand, eight hundred seventy-seven".