21340412 has 12 divisors (see below), whose sum is σ = 38969616. Its totient is φ = 10206240.

The previous prime is 21340411. The next prime is 21340421. The reversal of 21340412 is 21404312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115889 + ... + 116072.

It is an arithmetic number, because the mean of its divisors is an integer number (3247468).

Almost surely, 2^21340412 is an apocalyptic number.

It is an amenable number.

21340412 is a deficient number, since it is larger than the sum of its proper divisors (17629204).

21340412 is a wasteful number, since it uses less digits than its factorization.

21340412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231988 (or 231986 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21340412 is about 4619.5683781063. The cubic root of 21340412 is about 277.3751818064.

Adding to 21340412 its reverse (21404312), we get a palindrome (42744724).

The spelling of 21340412 in words is "twenty-one million, three hundred forty thousand, four hundred twelve".