21492149 has 16 divisors (see below), whose sum is σ = 25162368. Its totient is φ = 17978112.

The previous prime is 21492067. The next prime is 21492151. The reversal of 21492149 is 94129412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21492149 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492349) 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, 69854 + ... + 70160.

It is an arithmetic number, because the mean of its divisors is an integer number (1572648).

Almost surely, 2^21492149 is an apocalyptic number.

It is an amenable number.

21492149 is a deficient number, since it is larger than the sum of its proper divisors (3670219).

21492149 is a wasteful number, since it uses less digits than its factorization.

21492149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its digits is 5184, while the sum is 32.

The square root of 21492149 is about 4635.9625753451. The cubic root of 21492149 is about 278.0310378885.

The spelling of 21492149 in words is "twenty-one million, four hundred ninety-two thousand, one hundred forty-nine".