21669652 has 24 divisors (see below), whose sum is σ = 40118400. Its totient is φ = 10213056.

The previous prime is 21669649. The next prime is 21669667. The reversal of 21669652 is 25696612.

It is a super-2 number, since 2×21669652² = 939147635602208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17568 + ... + 18760.

It is an arithmetic number, because the mean of its divisors is an integer number (1671600).

Almost surely, 2^21669652 is an apocalyptic number.

It is an amenable number.

21669652 is a deficient number, since it is larger than the sum of its proper divisors (18448748).

21669652 is a wasteful number, since it uses less digits than its factorization.

21669652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455 (or 1453 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 21669652 is about 4655.0673464516. The cubic root of 21669652 is about 278.7943569273.

The spelling of 21669652 in words is "twenty-one million, six hundred sixty-nine thousand, six hundred fifty-two".