21241394 has 12 divisors (see below), whose sum is σ = 32320746. Its totient is φ = 10469952.

The previous prime is 21241391. The next prime is 21241399. The reversal of 21241394 is 49314212.

21241394 = T₂₂₆ + T₂₂₇ + ... + T₅₁₇.

It can be written as a sum of positive squares in 3 ways, for example, as 20367169 + 874225 = 4513^2 + 935^2 .

It is not an unprimeable number, because it can be changed into a prime (21241391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9662 + ... + 11654.

Almost surely, 2^21241394 is an apocalyptic number.

21241394 is a deficient number, since it is larger than the sum of its proper divisors (11079352).

21241394 is an equidigital number, since it uses as much as digits as its factorization.

21241394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141 (or 2068 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 21241394 is about 4608.8386823581. The cubic root of 21241394 is about 276.9455161818.

The spelling of 21241394 in words is "twenty-one million, two hundred forty-one thousand, three hundred ninety-four".