21054669 has 8 divisors (see below), whose sum is σ = 28095552. Its totient is φ = 14025120.

The previous prime is 21054661. The next prime is 21054697. The reversal of 21054669 is 96645012.

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

It is not a de Polignac number, because 21054669 - 2³ = 21054661 is a prime.

It is a super-2 number, since 2×21054669² = 886598173399122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3577 + ... + 7409.

It is an arithmetic number, because the mean of its divisors is an integer number (3511944).

Almost surely, 2^21054669 is an apocalyptic number.

It is an amenable number.

21054669 is a deficient number, since it is larger than the sum of its proper divisors (7040883).

21054669 is a wasteful number, since it uses less digits than its factorization.

21054669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5667.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 21054669 is about 4588.5366948516. The cubic root of 21054669 is about 276.1316191179.

The spelling of 21054669 in words is "twenty-one million, fifty-four thousand, six hundred sixty-nine".