21277619863 has 2 divisors, whose sum is σ = 21277619864. Its totient is φ = 21277619862.

The previous prime is 21277619809. The next prime is 21277619879. The reversal of 21277619863 is 36891677212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21277619863 - 2¹³ = 21277611671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21277619863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21277619663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10638809931 + 10638809932.

It is an arithmetic number, because the mean of its divisors is an integer number (10638809932).

Almost surely, 2^21277619863 is an apocalyptic number.

21277619863 is a deficient number, since it is larger than the sum of its proper divisors (1).

21277619863 is an equidigital number, since it uses as much as digits as its factorization.

21277619863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 52.

The spelling of 21277619863 in words is "twenty-one billion, two hundred seventy-seven million, six hundred nineteen thousand, eight hundred sixty-three".