21965428694 has 8 divisors (see below), whose sum is σ = 35943428808. Its totient is φ = 9984285760.

The previous prime is 21965428691. The next prime is 21965428729. The reversal of 21965428694 is 49682456912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21965428694² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21965428691) 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, 499214267 + ... + 499214310.

It is an arithmetic number, because the mean of its divisors is an integer number (4492928601).

Almost surely, 2^21965428694 is an apocalyptic number.

21965428694 is a deficient number, since it is larger than the sum of its proper divisors (13978000114).

21965428694 is a wasteful number, since it uses less digits than its factorization.

21965428694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998428590.

The product of its digits is 7464960, while the sum is 56.

The spelling of 21965428694 in words is "twenty-one billion, nine hundred sixty-five million, four hundred twenty-eight thousand, six hundred ninety-four".