21357965669 has 8 divisors (see below), whose sum is σ = 22619209920. Its totient is φ = 20124441216.

The previous prime is 21357965663. The next prime is 21357965687. The reversal of 21357965669 is 96656975312.

It is a happy number.

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 21357965669 - 2³² = 17062998373 is a prime.

It is a super-2 number, since 2×21357965669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357965663) 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, 6928364 + ... + 6931445.

It is an arithmetic number, because the mean of its divisors is an integer number (2827401240).

Almost surely, 2^21357965669 is an apocalyptic number.

It is an amenable number.

21357965669 is a deficient number, since it is larger than the sum of its proper divisors (1261244251).

21357965669 is a wasteful number, since it uses less digits than its factorization.

21357965669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13859899.

The product of its digits is 18370800, while the sum is 59.

The spelling of 21357965669 in words is "twenty-one billion, three hundred fifty-seven million, nine hundred sixty-five thousand, six hundred sixty-nine".