21490158 has 8 divisors (see below), whose sum is σ = 42980328. Its totient is φ = 7163384.

The previous prime is 21490151. The next prime is 21490177. The reversal of 21490158 is 85109412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21490158 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21490151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1790841 + ... + 1790852.

It is an arithmetic number, because the mean of its divisors is an integer number (5372541).

Almost surely, 2^21490158 is an apocalyptic number.

21490158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21490158 is a wasteful number, since it uses less digits than its factorization.

21490158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581698.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 21490158 is about 4635.7478361102. The cubic root of 21490158 is about 278.0224521659.

The spelling of 21490158 in words is "twenty-one million, four hundred ninety thousand, one hundred fifty-eight".