21923079387 has 8 divisors (see below), whose sum is σ = 31888115520. Its totient is φ = 13286714760.

The previous prime is 21923079361. The next prime is 21923079401. The reversal of 21923079387 is 78397032912.

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

It is not a de Polignac number, because 21923079387 - 2⁷ = 21923079259 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21923079887) 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, 332167837 + ... + 332167902.

It is an arithmetic number, because the mean of its divisors is an integer number (3986014440).

Almost surely, 2^21923079387 is an apocalyptic number.

21923079387 is a deficient number, since it is larger than the sum of its proper divisors (9965036133).

21923079387 is a wasteful number, since it uses less digits than its factorization.

21923079387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664335753.

The product of its (nonzero) digits is 1143072, while the sum is 51.

The spelling of 21923079387 in words is "twenty-one billion, nine hundred twenty-three million, seventy-nine thousand, three hundred eighty-seven".