21772532911 has 2 divisors, whose sum is σ = 21772532912. Its totient is φ = 21772532910.

The previous prime is 21772532857. The next prime is 21772532917. The reversal of 21772532911 is 11923527712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21772532911 - 2⁷ = 21772532783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21772532917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10886266455 + 10886266456.

It is an arithmetic number, because the mean of its divisors is an integer number (10886266456).

Almost surely, 2^21772532911 is an apocalyptic number.

21772532911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21772532911 is an equidigital number, since it uses as much as digits as its factorization.

21772532911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 40.

The spelling of 21772532911 in words is "twenty-one billion, seven hundred seventy-two million, five hundred thirty-two thousand, nine hundred eleven".