21590412 has 24 divisors (see below), whose sum is σ = 50638896. Its totient is φ = 7159488.

The previous prime is 21590411. The next prime is 21590417. The reversal of 21590412 is 21409512.

It is a super-2 number, since 2×21590412² = 932291780659488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21590411) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2203 + ... + 6930.

It is an arithmetic number, because the mean of its divisors is an integer number (2109954).

Almost surely, 2^21590412 is an apocalyptic number.

It is an amenable number.

21590412 is an abundant number, since it is smaller than the sum of its proper divisors (29048484).

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

21590412 is a wasteful number, since it uses less digits than its factorization.

21590412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9337 (or 9335 counting only the distinct ones).

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

The square root of 21590412 is about 4646.5483963906. The cubic root of 21590412 is about 278.4541169240.

Adding to 21590412 its reverse (21409512), we get a palindrome (42999924).

The spelling of 21590412 in words is "twenty-one million, five hundred ninety thousand, four hundred twelve".