21935769 has 8 divisors (see below), whose sum is σ = 29272992. Its totient is φ = 14611200.

The previous prime is 21935761. The next prime is 21935791. The reversal of 21935769 is 96753912.

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

It is not a de Polignac number, because 21935769 - 2³ = 21935761 is a prime.

It is a super-2 number, since 2×21935769² = 962355923242722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21935769.

It is not an unprimeable number, because it can be changed into a prime (21935761) 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, 2169 + ... + 6969.

It is an arithmetic number, because the mean of its divisors is an integer number (3659124).

Almost surely, 2^21935769 is an apocalyptic number.

It is an amenable number.

21935769 is a deficient number, since it is larger than the sum of its proper divisors (7337223).

21935769 is a wasteful number, since it uses less digits than its factorization.

21935769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6327.

The product of its digits is 102060, while the sum is 42.

The square root of 21935769 is about 4683.5637072639. The cubic root of 21935769 is about 279.9309736311.

The spelling of 21935769 in words is "twenty-one million, nine hundred thirty-five thousand, seven hundred sixty-nine".