21250640323 has 8 divisors (see below), whose sum is σ = 23183778096. Its totient is φ = 19317712800.

The previous prime is 21250640317. The next prime is 21250640351. The reversal of 21250640323 is 32304605212.

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

It is a cyclic number.

It is not a de Polignac number, because 21250640323 - 2⁹ = 21250639811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21250640291 and 21250640300.

It is not an unprimeable number, because it can be changed into a prime (21250640123) 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, 220465 + ... + 301837.

It is an arithmetic number, because the mean of its divisors is an integer number (2897972262).

Almost surely, 2^21250640323 is an apocalyptic number.

21250640323 is a deficient number, since it is larger than the sum of its proper divisors (1933137773).

21250640323 is a wasteful number, since it uses less digits than its factorization.

21250640323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105125.

The product of its (nonzero) digits is 8640, while the sum is 28.

The spelling of 21250640323 in words is "twenty-one billion, two hundred fifty million, six hundred forty thousand, three hundred twenty-three".