21669126 has 8 divisors (see below), whose sum is σ = 43338264. Its totient is φ = 7223040.

The previous prime is 21669113. The next prime is 21669143. The reversal of 21669126 is 62196612.

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

21669126 is an admirable number.

It is a super-3 number, since 3×21669126³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1805755 + ... + 1805766.

It is an arithmetic number, because the mean of its divisors is an integer number (5417283).

Almost surely, 2^21669126 is an apocalyptic number.

21669126 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21669126 is a wasteful number, since it uses less digits than its factorization.

21669126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611526.

The product of its digits is 7776, while the sum is 33.

The square root of 21669126 is about 4655.0108485373. The cubic root of 21669126 is about 278.7921011302.

It can be divided in two parts, 2166 and 9126, that multiplied together give a square (19766916 = 4446²).

The spelling of 21669126 in words is "twenty-one million, six hundred sixty-nine thousand, one hundred twenty-six".