21776845523 has 2 divisors, whose sum is σ = 21776845524. Its totient is φ = 21776845522.

The previous prime is 21776845501. The next prime is 21776845537. The reversal of 21776845523 is 32554867712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21776845523 - 2¹⁶ = 21776779987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21776842523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10888422761 + 10888422762.

It is an arithmetic number, because the mean of its divisors is an integer number (10888422762).

Almost surely, 2^21776845523 is an apocalyptic number.

21776845523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21776845523 is an equidigital number, since it uses as much as digits as its factorization.

21776845523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 50.

The spelling of 21776845523 in words is "twenty-one billion, seven hundred seventy-six million, eight hundred forty-five thousand, five hundred twenty-three".