21713072229 has 6 divisors (see below), whose sum is σ = 31363326566. Its totient is φ = 14475381480.

The previous prime is 21713072189. The next prime is 21713072239. The reversal of 21713072229 is 92227031712.

It can be written as a sum of positive squares in only one way, i.e., 16924709025 + 4788363204 = 130095^2 + 69198^2 .

It is not a de Polignac number, because 21713072229 - 2⁸ = 21713071973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21713072193 and 21713072202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21713072239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1206281782 + ... + 1206281799.

Almost surely, 2^21713072229 is an apocalyptic number.

It is an amenable number.

21713072229 is a deficient number, since it is larger than the sum of its proper divisors (9650254337).

21713072229 is a wasteful number, since it uses less digits than its factorization.

21713072229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412563587 (or 2412563584 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The spelling of 21713072229 in words is "twenty-one billion, seven hundred thirteen million, seventy-two thousand, two hundred twenty-nine".