21450951579 has 4 divisors (see below), whose sum is σ = 28601268776. Its totient is φ = 14300634384.

The previous prime is 21450951547. The next prime is 21450951583. The reversal of 21450951579 is 97515905412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21450951579 - 2⁵ = 21450951547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21450951479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3575158594 + ... + 3575158599.

It is an arithmetic number, because the mean of its divisors is an integer number (7150317194).

Almost surely, 2^21450951579 is an apocalyptic number.

21450951579 is a deficient number, since it is larger than the sum of its proper divisors (7150317197).

21450951579 is an equidigital number, since it uses as much as digits as its factorization.

21450951579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7150317196.

The product of its (nonzero) digits is 567000, while the sum is 48.

The spelling of 21450951579 in words is "twenty-one billion, four hundred fifty million, nine hundred fifty-one thousand, five hundred seventy-nine".