21902772409 has 8 divisors (see below), whose sum is σ = 26504195328. Its totient is φ = 17669463360.

The previous prime is 21902772407. The next prime is 21902772413. The reversal of 21902772409 is 90427720912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21902772409 - 2¹ = 21902772407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21902772407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92028337 + ... + 92028574.

It is an arithmetic number, because the mean of its divisors is an integer number (3313024416).

Almost surely, 2^21902772409 is an apocalyptic number.

It is an amenable number.

21902772409 is a deficient number, since it is larger than the sum of its proper divisors (4601422919).

21902772409 is a wasteful number, since it uses less digits than its factorization.

21902772409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184056935.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 21902772409 in words is "twenty-one billion, nine hundred two million, seven hundred seventy-two thousand, four hundred nine".