21694296221 has 8 divisors (see below), whose sum is σ = 23365067040. Its totient is φ = 20023808112.

The previous prime is 21694296149. The next prime is 21694296263. The reversal of 21694296221 is 12269249612.

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 21694296221 - 2¹⁴ = 21694279837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694286221) 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, 104870 + ... + 233208.

It is an arithmetic number, because the mean of its divisors is an integer number (2920633380).

Almost surely, 2^21694296221 is an apocalyptic number.

It is an amenable number.

21694296221 is a deficient number, since it is larger than the sum of its proper divisors (1670770819).

21694296221 is a wasteful number, since it uses less digits than its factorization.

21694296221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141355.

The product of its digits is 186624, while the sum is 44.

The spelling of 21694296221 in words is "twenty-one billion, six hundred ninety-four million, two hundred ninety-six thousand, two hundred twenty-one".