21261139183 has 2 divisors, whose sum is σ = 21261139184. Its totient is φ = 21261139182.

The previous prime is 21261139121. The next prime is 21261139201. The reversal of 21261139183 is 38193116212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21261139183 - 2³³ = 12671204591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21261139103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10630569591 + 10630569592.

It is an arithmetic number, because the mean of its divisors is an integer number (10630569592).

Almost surely, 2^21261139183 is an apocalyptic number.

21261139183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21261139183 is an equidigital number, since it uses as much as digits as its factorization.

21261139183 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The spelling of 21261139183 in words is "twenty-one billion, two hundred sixty-one million, one hundred thirty-nine thousand, one hundred eighty-three".