21141858 has 16 divisors (see below), whose sum is σ = 42672960. Its totient is φ = 6982416.

The previous prime is 21141833. The next prime is 21141871. The reversal of 21141858 is 85814112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15510 + ... + 16817.

It is an arithmetic number, because the mean of its divisors is an integer number (2667060).

Almost surely, 2^21141858 is an apocalyptic number.

21141858 is an abundant number, since it is smaller than the sum of its proper divisors (21531102).

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

21141858 is a wasteful number, since it uses less digits than its factorization.

21141858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32441.

The product of its digits is 2560, while the sum is 30.

The square root of 21141858 is about 4598.0276206217. The cubic root of 21141858 is about 276.5122549278.

The spelling of 21141858 in words is "twenty-one million, one hundred forty-one thousand, eight hundred fifty-eight".