21290158 has 8 divisors (see below), whose sum is σ = 32372928. Its totient is φ = 10499184.

The previous prime is 21290141. The next prime is 21290161. The reversal of 21290158 is 85109212.

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

It is a super-3 number, since 3×21290158³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72766 + ... + 73057.

It is an arithmetic number, because the mean of its divisors is an integer number (4046616).

Almost surely, 2^21290158 is an apocalyptic number.

21290158 is a deficient number, since it is larger than the sum of its proper divisors (11082770).

21290158 is a wasteful number, since it uses less digits than its factorization.

21290158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145898.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 21290158 is about 4614.1259193915. The cubic root of 21290158 is about 277.1572827264.

The spelling of 21290158 in words is "twenty-one million, two hundred ninety thousand, one hundred fifty-eight".