21654262151 has 2 divisors, whose sum is σ = 21654262152. Its totient is φ = 21654262150.

The previous prime is 21654262129. The next prime is 21654262163. The reversal of 21654262151 is 15126245612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21654262151 - 2⁶ = 21654262087 is a prime.

It is a super-2 number, since 2×21654262151² (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 (21654262951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10827131075 + 10827131076.

It is an arithmetic number, because the mean of its divisors is an integer number (10827131076).

Almost surely, 2^21654262151 is an apocalyptic number.

21654262151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21654262151 is an equidigital number, since it uses as much as digits as its factorization.

21654262151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The spelling of 21654262151 in words is "twenty-one billion, six hundred fifty-four million, two hundred sixty-two thousand, one hundred fifty-one".