21466090 has 16 divisors (see below), whose sum is σ = 39971880. Its totient is φ = 8290240.

The previous prime is 21466079. The next prime is 21466091. The reversal of 21466090 is 9066412.

It can be written as a sum of positive squares in 4 ways, for example, as 15468489 + 5997601 = 3933^2 + 2449^2 .

It is not an unprimeable number, because it can be changed into a prime (21466091) 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, 36721 + ... + 37300.

Almost surely, 2^21466090 is an apocalyptic number.

21466090 is a deficient number, since it is larger than the sum of its proper divisors (18505790).

21466090 is a wasteful number, since it uses less digits than its factorization.

21466090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74057.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21466090 is about 4633.1511954608. The cubic root of 21466090 is about 277.9186225590.

The spelling of 21466090 in words is "twenty-one million, four hundred sixty-six thousand, ninety".