21612067627 has 2 divisors, whose sum is σ = 21612067628. Its totient is φ = 21612067626.

The previous prime is 21612067613. The next prime is 21612067643. The reversal of 21612067627 is 72676021612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21612067627 is a prime.

It is a super-2 number, since 2×21612067627² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21612067627.

It is not a weakly prime, because it can be changed into another prime (21612067667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806033813 + 10806033814.

It is an arithmetic number, because the mean of its divisors is an integer number (10806033814).

Almost surely, 2^21612067627 is an apocalyptic number.

21612067627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612067627 is an equidigital number, since it uses as much as digits as its factorization.

21612067627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 21612067627 in words is "twenty-one billion, six hundred twelve million, sixty-seven thousand, six hundred twenty-seven".