21346569 has 12 divisors (see below), whose sum is σ = 31828992. Its totient is φ = 13771800.

The previous prime is 21346547. The next prime is 21346571. The reversal of 21346569 is 96564312.

It is a happy number.

It is not a de Polignac number, because 21346569 - 2⁵ = 21346537 is a prime.

It is a super-2 number, since 2×21346569² = 911352016143522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21346069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37977 + ... + 38534.

It is an arithmetic number, because the mean of its divisors is an integer number (2652416).

Almost surely, 2^21346569 is an apocalyptic number.

It is an amenable number.

21346569 is a deficient number, since it is larger than the sum of its proper divisors (10482423).

21346569 is a wasteful number, since it uses less digits than its factorization.

21346569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76548 (or 76545 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21346569 is about 4620.2347342965. The cubic root of 21346569 is about 277.4018547494.

The spelling of 21346569 in words is "twenty-one million, three hundred forty-six thousand, five hundred sixty-nine".