21915626349 has 16 divisors (see below), whose sum is σ = 29497917440. Its totient is φ = 14472244080.

The previous prime is 21915626339. The next prime is 21915626371. The reversal of 21915626349 is 94362651912.

It is not a de Polignac number, because 21915626349 - 2⁸ = 21915626093 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21915626298 and 21915626307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21915626339) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 194832 + ... + 285990.

It is an arithmetic number, because the mean of its divisors is an integer number (1843619840).

Almost surely, 2^21915626349 is an apocalyptic number.

It is an amenable number.

21915626349 is a deficient number, since it is larger than the sum of its proper divisors (7582291091).

21915626349 is a wasteful number, since it uses less digits than its factorization.

21915626349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91920.

The product of its digits is 699840, while the sum is 48.

The spelling of 21915626349 in words is "twenty-one billion, nine hundred fifteen million, six hundred twenty-six thousand, three hundred forty-nine".