21696227993 has 4 divisors (see below), whose sum is σ = 23668612368. Its totient is φ = 19723843620.

The previous prime is 21696227981. The next prime is 21696228023. The reversal of 21696227993 is 39972269612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21696227993 - 2²² = 21692033689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21696227933) 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, 986192171 + ... + 986192192.

It is an arithmetic number, because the mean of its divisors is an integer number (5917153092).

Almost surely, 2^21696227993 is an apocalyptic number.

It is an amenable number.

21696227993 is a deficient number, since it is larger than the sum of its proper divisors (1972384375).

21696227993 is a wasteful number, since it uses less digits than its factorization.

21696227993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972384374.

The product of its digits is 4408992, while the sum is 56.

The spelling of 21696227993 in words is "twenty-one billion, six hundred ninety-six million, two hundred twenty-seven thousand, nine hundred ninety-three".