21493996627 has 4 divisors (see below), whose sum is σ = 21494435976. Its totient is φ = 21493557280.

The previous prime is 21493996541. The next prime is 21493996633. The reversal of 21493996627 is 72669939412.

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 21493996627 - 2²⁷ = 21359778899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21493996127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135553 + ... + 247714.

It is an arithmetic number, because the mean of its divisors is an integer number (5373608994).

Almost surely, 2^21493996627 is an apocalyptic number.

21493996627 is a deficient number, since it is larger than the sum of its proper divisors (439349).

21493996627 is an equidigital number, since it uses as much as digits as its factorization.

21493996627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439348.

The product of its digits is 8817984, while the sum is 58.

The spelling of 21493996627 in words is "twenty-one billion, four hundred ninety-three million, nine hundred ninety-six thousand, six hundred twenty-seven".