21590214 has 32 divisors (see below), whose sum is σ = 44880000. Its totient is φ = 6918912.

The previous prime is 21590201. The next prime is 21590237. The reversal of 21590214 is 41209512.

It is a super-2 number, since 2×21590214² = 932274681131592, which contains 22 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16662 + ... + 17910.

It is an arithmetic number, because the mean of its divisors is an integer number (1402500).

Almost surely, 2^21590214 is an apocalyptic number.

21590214 is an abundant number, since it is smaller than the sum of its proper divisors (23289786).

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

21590214 is a wasteful number, since it uses less digits than its factorization.

21590214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21590214 is about 4646.5270902040. The cubic root of 21590214 is about 278.4532657115.

Adding to 21590214 its reverse (41209512), we get a palindrome (62799726).

The spelling of 21590214 in words is "twenty-one million, five hundred ninety thousand, two hundred fourteen".