21492097 has 32 divisors (see below), whose sum is σ = 27371520. Its totient is φ = 16600320.

The previous prime is 21492067. The next prime is 21492151. The reversal of 21492097 is 79029412.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21492097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21492007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81588 + ... + 81850.

It is an arithmetic number, because the mean of its divisors is an integer number (855360).

Almost surely, 2^21492097 is an apocalyptic number.

It is an amenable number.

21492097 is a deficient number, since it is larger than the sum of its proper divisors (5879423).

21492097 is a wasteful number, since it uses less digits than its factorization.

21492097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 21492097 is about 4635.9569670134. The cubic root of 21492097 is about 278.0308136574.

The spelling of 21492097 in words is "twenty-one million, four hundred ninety-two thousand, ninety-seven".