21126532279 has 2 divisors, whose sum is σ = 21126532280. Its totient is φ = 21126532278.

The previous prime is 21126532267. The next prime is 21126532337. The reversal of 21126532279 is 97223562112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21126532279 - 2⁷ = 21126532151 is a prime.

It is a super-2 number, since 2×21126532279² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21126532249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563266139 + 10563266140.

It is an arithmetic number, because the mean of its divisors is an integer number (10563266140).

Almost surely, 2^21126532279 is an apocalyptic number.

21126532279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126532279 is an equidigital number, since it uses as much as digits as its factorization.

21126532279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The spelling of 21126532279 in words is "twenty-one billion, one hundred twenty-six million, five hundred thirty-two thousand, two hundred seventy-nine".