21949490443 has 4 divisors (see below), whose sum is σ = 22070758528. Its totient is φ = 21828222360.

The previous prime is 21949490413. The next prime is 21949490461. The reversal of 21949490443 is 34409494912.

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

It is a cyclic number.

It is not a de Polignac number, because 21949490443 - 2⁹ = 21949489931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21949490413) 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, 60633771 + ... + 60634132.

It is an arithmetic number, because the mean of its divisors is an integer number (5517689632).

Almost surely, 2^21949490443 is an apocalyptic number.

21949490443 is a deficient number, since it is larger than the sum of its proper divisors (121268085).

21949490443 is a wasteful number, since it uses less digits than its factorization.

21949490443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121268084.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 21949490443 in words is "twenty-one billion, nine hundred forty-nine million, four hundred ninety thousand, four hundred forty-three".