21930446739 has 8 divisors (see below), whose sum is σ = 29308127632. Its totient is φ = 14586531840.

The previous prime is 21930446711. The next prime is 21930446761. The reversal of 21930446739 is 93764403912.

It is a happy number.

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

It is not a de Polignac number, because 21930446739 - 2¹⁶ = 21930381203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21930446789) 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, 8439982 + ... + 8442579.

It is an arithmetic number, because the mean of its divisors is an integer number (3663515954).

Almost surely, 2^21930446739 is an apocalyptic number.

21930446739 is a deficient number, since it is larger than the sum of its proper divisors (7377680893).

21930446739 is a wasteful number, since it uses less digits than its factorization.

21930446739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16882997.

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 21930446739 in words is "twenty-one billion, nine hundred thirty million, four hundred forty-six thousand, seven hundred thirty-nine".