27211711621 has 2 divisors, whose sum is σ = 27211711622. Its totient is φ = 27211711620.

The previous prime is 27211711577. The next prime is 27211711649. The reversal of 27211711621 is 12611711272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18343722721 + 8867988900 = 135439^2 + 94170^2 .

It is a cyclic number.

It is not a de Polignac number, because 27211711621 - 2²⁷ = 27077493893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27211711421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13605855810 + 13605855811.

It is an arithmetic number, because the mean of its divisors is an integer number (13605855811).

Almost surely, 2^27211711621 is an apocalyptic number.

It is an amenable number.

27211711621 is a deficient number, since it is larger than the sum of its proper divisors (1).

27211711621 is an equidigital number, since it uses as much as digits as its factorization.

27211711621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 31.

The spelling of 27211711621 in words is "twenty-seven billion, two hundred eleven million, seven hundred eleven thousand, six hundred twenty-one".