21172867627 has 2 divisors, whose sum is σ = 21172867628. Its totient is φ = 21172867626.

The previous prime is 21172867619. The next prime is 21172867631. The reversal of 21172867627 is 72676827112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21172867627 - 2³ = 21172867619 is a prime.

It is a super-2 number, since 2×21172867627² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21172867697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10586433813 + 10586433814.

It is an arithmetic number, because the mean of its divisors is an integer number (10586433814).

Almost surely, 2^21172867627 is an apocalyptic number.

21172867627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21172867627 is an equidigital number, since it uses as much as digits as its factorization.

21172867627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 49.

The spelling of 21172867627 in words is "twenty-one billion, one hundred seventy-two million, eight hundred sixty-seven thousand, six hundred twenty-seven".