21166701 has 16 divisors (see below), whose sum is σ = 29698368. Its totient is φ = 13392000.

The previous prime is 21166679. The next prime is 21166711. The reversal of 21166701 is 10766112.

It is not a de Polignac number, because 21166701 - 2¹⁷ = 21035629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2226 + ... + 6876.

It is an arithmetic number, because the mean of its divisors is an integer number (1856148).

Almost surely, 2^21166701 is an apocalyptic number.

It is an amenable number.

21166701 is a deficient number, since it is larger than the sum of its proper divisors (8531667).

21166701 is a wasteful number, since it uses less digits than its factorization.

21166701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21166701 is about 4600.7283119089. The cubic root of 21166701 is about 276.6205189074.

The spelling of 21166701 in words is "twenty-one million, one hundred sixty-six thousand, seven hundred one".