21930457649 has 8 divisors (see below), whose sum is σ = 22442620992. Its totient is φ = 21418392240.

The previous prime is 21930457603. The next prime is 21930457697. The reversal of 21930457649 is 94675403912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21930457649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21930457597 and 21930457606.

It is not an unprimeable number, because it can be changed into a prime (21930457349) 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, 630692 + ... + 664554.

It is an arithmetic number, because the mean of its divisors is an integer number (2805327624).

Almost surely, 2^21930457649 is an apocalyptic number.

It is an amenable number.

21930457649 is a deficient number, since it is larger than the sum of its proper divisors (512163343).

21930457649 is a wasteful number, since it uses less digits than its factorization.

21930457649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48967.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 21930457649 in words is "twenty-one billion, nine hundred thirty million, four hundred fifty-seven thousand, six hundred forty-nine".