21769005 has 8 divisors (see below), whose sum is σ = 34830432. Its totient is φ = 11610128.

The previous prime is 21768997. The next prime is 21769039. The reversal of 21769005 is 50096712.

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

It is a cyclic number.

It is not a de Polignac number, because 21769005 - 2³ = 21768997 is a prime.

It is a congruent number.

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, 725619 + ... + 725648.

It is an arithmetic number, because the mean of its divisors is an integer number (4353804).

Almost surely, 2^21769005 is an apocalyptic number.

It is an amenable number.

21769005 is a deficient number, since it is larger than the sum of its proper divisors (13061427).

21769005 is a wasteful number, since it uses less digits than its factorization.

21769005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451275.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 21769005 is about 4665.7266315120. The cubic root of 21769005 is about 279.2197880149.

The spelling of 21769005 in words is "twenty-one million, seven hundred sixty-nine thousand, five".