21133839551 has 12 divisors (see below), whose sum is σ = 23377738776. Its totient is φ = 19090191120.

The previous prime is 21133839539. The next prime is 21133839557. The reversal of 21133839551 is 15593833112.

It is not a de Polignac number, because 21133839551 - 2³⁴ = 3953970367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21133839499 and 21133839508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133839557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 537245 + ... + 575238.

It is an arithmetic number, because the mean of its divisors is an integer number (1948144898).

Almost surely, 2^21133839551 is an apocalyptic number.

21133839551 is a deficient number, since it is larger than the sum of its proper divisors (2243899225).

21133839551 is a wasteful number, since it uses less digits than its factorization.

21133839551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112662 (or 1112651 counting only the distinct ones).

The product of its digits is 97200, while the sum is 41.

The spelling of 21133839551 in words is "twenty-one billion, one hundred thirty-three million, eight hundred thirty-nine thousand, five hundred fifty-one".