21677045 has 8 divisors (see below), whose sum is σ = 28013496. Its totient is φ = 16007616.

The previous prime is 21677041. The next prime is 21677077. The reversal of 21677045 is 54077612.

It can be written as a sum of positive squares in 4 ways, for example, as 128881 + 21548164 = 359^2 + 4642^2 .

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 21677045 - 2² = 21677041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21677041) 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, 166682 + ... + 166811.

It is an arithmetic number, because the mean of its divisors is an integer number (3501687).

Almost surely, 2^21677045 is an apocalyptic number.

It is an amenable number.

21677045 is a deficient number, since it is larger than the sum of its proper divisors (6336451).

21677045 is a wasteful number, since it uses less digits than its factorization.

21677045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333511.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21677045 is about 4655.8613596197. The cubic root of 21677045 is about 278.8260585951.

The spelling of 21677045 in words is "twenty-one million, six hundred seventy-seven thousand, forty-five".