21990314647 has 8 divisors (see below), whose sum is σ = 25155483552. Its totient is φ = 18831069600.

The previous prime is 21990314629. The next prime is 21990314653. The reversal of 21990314647 is 74641309912.

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

It is not a de Polignac number, because 21990314647 - 2⁷ = 21990314519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21990314597 and 21990314606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21990314347) 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 7 ways as a sum of consecutive naturals, for example, 1473004 + ... + 1487857.

It is an arithmetic number, because the mean of its divisors is an integer number (3144435444).

Almost surely, 2^21990314647 is an apocalyptic number.

21990314647 is a deficient number, since it is larger than the sum of its proper divisors (3165168905).

21990314647 is a wasteful number, since it uses less digits than its factorization.

21990314647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961929.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 21990314647 in words is "twenty-one billion, nine hundred ninety million, three hundred fourteen thousand, six hundred forty-seven".