21137651783 has 2 divisors, whose sum is σ = 21137651784. Its totient is φ = 21137651782.

The previous prime is 21137651707. The next prime is 21137651789. The reversal of 21137651783 is 38715673112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21137651783 - 2²⁶ = 21070542919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21137651789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568825891 + 10568825892.

It is an arithmetic number, because the mean of its divisors is an integer number (10568825892).

Almost surely, 2^21137651783 is an apocalyptic number.

21137651783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21137651783 is an equidigital number, since it uses as much as digits as its factorization.

21137651783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The spelling of 21137651783 in words is "twenty-one billion, one hundred thirty-seven million, six hundred fifty-one thousand, seven hundred eighty-three".