21492082 has 4 divisors (see below), whose sum is σ = 32238126. Its totient is φ = 10746040.

The previous prime is 21492067. The next prime is 21492151. The reversal of 21492082 is 28029412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15832441 + 5659641 = 3979^2 + 2379^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21492082.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5373019 + ... + 5373022.

Almost surely, 2^21492082 is an apocalyptic number.

21492082 is a deficient number, since it is larger than the sum of its proper divisors (10746044).

21492082 is a wasteful number, since it uses less digits than its factorization.

21492082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10746043.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21492082 is about 4635.9553492241. The cubic root of 21492082 is about 278.0307489753.

The spelling of 21492082 in words is "twenty-one million, four hundred ninety-two thousand, eighty-two".