21377066 has 8 divisors (see below), whose sum is σ = 32232324. Its totient is φ = 10632960.

The previous prime is 21377039. The next prime is 21377077. The reversal of 21377066 is 66077312.

It can be written as a sum of positive squares in 2 ways, for example, as 20894041 + 483025 = 4571^2 + 695^2 .

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

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, 27305 + ... + 28076.

Almost surely, 2^21377066 is an apocalyptic number.

21377066 is a deficient number, since it is larger than the sum of its proper divisors (10855258).

21377066 is a wasteful number, since it uses less digits than its factorization.

21377066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55576.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 21377066 is about 4623.5339297987. The cubic root of 21377066 is about 277.5338962463.

The spelling of 21377066 in words is "twenty-one million, three hundred seventy-seven thousand, sixty-six".