21214158 has 48 divisors (see below), whose sum is σ = 50232960. Its totient is φ = 5953584.

The previous prime is 21214139. The next prime is 21214159. The reversal of 21214158 is 85141212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16735 + ... + 17957.

It is an arithmetic number, because the mean of its divisors is an integer number (1046520).

Almost surely, 2^21214158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21214158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25116480).

21214158 is an abundant number, since it is smaller than the sum of its proper divisors (29018802).

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

21214158 is a wasteful number, since it uses less digits than its factorization.

21214158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301 (or 1294 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 21214158 is about 4605.8829772368. The cubic root of 21214158 is about 276.8270978043.

The spelling of 21214158 in words is "twenty-one million, two hundred fourteen thousand, one hundred fifty-eight".