21727377803 has 2 divisors, whose sum is σ = 21727377804. Its totient is φ = 21727377802.

The previous prime is 21727377647. The next prime is 21727377809. The reversal of 21727377803 is 30877372712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21727377803 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21727377809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10863688901 + 10863688902.

It is an arithmetic number, because the mean of its divisors is an integer number (10863688902).

Almost surely, 2^21727377803 is an apocalyptic number.

21727377803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21727377803 is an equidigital number, since it uses as much as digits as its factorization.

21727377803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691488, while the sum is 47.

The spelling of 21727377803 in words is "twenty-one billion, seven hundred twenty-seven million, three hundred seventy-seven thousand, eight hundred three".