21154252759 has 2 divisors, whose sum is σ = 21154252760. Its totient is φ = 21154252758.

The previous prime is 21154252727. The next prime is 21154252771. The reversal of 21154252759 is 95725245112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21154252759 - 2⁵ = 21154252727 is a prime.

It is a super-2 number, since 2×21154252759² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21154252789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577126379 + 10577126380.

It is an arithmetic number, because the mean of its divisors is an integer number (10577126380).

Almost surely, 2^21154252759 is an apocalyptic number.

21154252759 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154252759 is an equidigital number, since it uses as much as digits as its factorization.

21154252759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 43.

The spelling of 21154252759 in words is "twenty-one billion, one hundred fifty-four million, two hundred fifty-two thousand, seven hundred fifty-nine".