21734569 has 4 divisors (see below), whose sum is σ = 21830544. Its totient is φ = 21638596.

The previous prime is 21734527. The next prime is 21734593. The reversal of 21734569 is 96543712.

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 a de Polignac number, because none of the positive numbers 2^k-21734569 is a prime.

It is a super-2 number, since 2×21734569² = 944782979231522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21734519) 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, 47647 + ... + 48100.

It is an arithmetic number, because the mean of its divisors is an integer number (5457636).

Almost surely, 2^21734569 is an apocalyptic number.

It is an amenable number.

21734569 is a deficient number, since it is larger than the sum of its proper divisors (95975).

21734569 is an equidigital number, since it uses as much as digits as its factorization.

21734569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95974.

The product of its digits is 45360, while the sum is 37.

The square root of 21734569 is about 4662.0348561546. The cubic root of 21734569 is about 279.0724793816.

The spelling of 21734569 in words is "twenty-one million, seven hundred thirty-four thousand, five hundred sixty-nine".