21949472269 has 2 divisors, whose sum is σ = 21949472270. Its totient is φ = 21949472268.

The previous prime is 21949472203. The next prime is 21949472291. The reversal of 21949472269 is 96227494912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18508242025 + 3441230244 = 136045^2 + 58662^2 .

It is a cyclic number.

It is not a de Polignac number, because 21949472269 - 2⁷ = 21949472141 is a prime.

It is a super-2 number, since 2×21949472269² (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 (21949472569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10974736134 + 10974736135.

It is an arithmetic number, because the mean of its divisors is an integer number (10974736135).

Almost surely, 2^21949472269 is an apocalyptic number.

It is an amenable number.

21949472269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21949472269 is an equidigital number, since it uses as much as digits as its factorization.

21949472269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 55.

The spelling of 21949472269 in words is "twenty-one billion, nine hundred forty-nine million, four hundred seventy-two thousand, two hundred sixty-nine".