21174157127 has 2 divisors, whose sum is σ = 21174157128. Its totient is φ = 21174157126.

The previous prime is 21174157057. The next prime is 21174157171. The reversal of 21174157127 is 72175147112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21174157127 - 2¹⁰ = 21174156103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21174157027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10587078563 + 10587078564.

It is an arithmetic number, because the mean of its divisors is an integer number (10587078564).

Almost surely, 2^21174157127 is an apocalyptic number.

21174157127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21174157127 is an equidigital number, since it uses as much as digits as its factorization.

21174157127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27440, while the sum is 38.

The spelling of 21174157127 in words is "twenty-one billion, one hundred seventy-four million, one hundred fifty-seven thousand, one hundred twenty-seven".