21669324 has 24 divisors (see below), whose sum is σ = 50658048. Its totient is φ = 7209360.

The previous prime is 21669317. The next prime is 21669331. The reversal of 21669324 is 42396612.

It is an interprime number because it is at equal distance from previous prime (21669317) and next prime (21669331).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6369 + ... + 9159.

It is an arithmetic number, because the mean of its divisors is an integer number (2110752).

Almost surely, 2^21669324 is an apocalyptic number.

It is an amenable number.

21669324 is an abundant number, since it is smaller than the sum of its proper divisors (28988724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21669324 is a wasteful number, since it uses less digits than its factorization.

21669324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445 (or 3443 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 21669324 is about 4655.0321158935. The cubic root of 21669324 is about 278.7929502748.

The spelling of 21669324 in words is "twenty-one million, six hundred sixty-nine thousand, three hundred twenty-four".