21229194 has 64 divisors (see below), whose sum is σ = 52531200. Its totient is φ = 5583168.

The previous prime is 21229177. The next prime is 21229199. The reversal of 21229194 is 49192212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21229199) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 29167 + ... + 29885.

It is an arithmetic number, because the mean of its divisors is an integer number (820800).

Almost surely, 2^21229194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21229194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26265600).

21229194 is an abundant number, since it is smaller than the sum of its proper divisors (31302006).

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

21229194 is a wasteful number, since it uses less digits than its factorization.

21229194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787.

The product of its digits is 2592, while the sum is 30.

The square root of 21229194 is about 4607.5149484294. The cubic root of 21229194 is about 276.8924847853.

The spelling of 21229194 in words is "twenty-one million, two hundred twenty-nine thousand, one hundred ninety-four".