21126652265 has 4 divisors (see below), whose sum is σ = 25351982724. Its totient is φ = 16901321808.

The previous prime is 21126652249. The next prime is 21126652271. The reversal of 21126652265 is 56225662112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13825291561 + 7301360704 = 117581^2 + 85448^2 .

It is a cyclic number.

It is not a de Polignac number, because 21126652265 - 2⁴ = 21126652249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112665222 + ... + 2112665231.

It is an arithmetic number, because the mean of its divisors is an integer number (6337995681).

Almost surely, 2^21126652265 is an apocalyptic number.

It is an amenable number.

21126652265 is a deficient number, since it is larger than the sum of its proper divisors (4225330459).

21126652265 is an equidigital number, since it uses as much as digits as its factorization.

21126652265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4225330458.

The product of its digits is 86400, while the sum is 38.

The spelling of 21126652265 in words is "twenty-one billion, one hundred twenty-six million, six hundred fifty-two thousand, two hundred sixty-five".