21341864 has 16 divisors (see below), whose sum is σ = 42122400. Its totient is φ = 10109232.

The previous prime is 21341863. The next prime is 21341867. The reversal of 21341864 is 46814312.

It is not an unprimeable number, because it can be changed into a prime (21341863) 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 3 ways as a sum of consecutive naturals, for example, 70052 + ... + 70355.

It is an arithmetic number, because the mean of its divisors is an integer number (2632650).

Almost surely, 2^21341864 is an apocalyptic number.

It is an amenable number.

21341864 is a deficient number, since it is larger than the sum of its proper divisors (20780536).

21341864 is a wasteful number, since it uses less digits than its factorization.

21341864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140432 (or 140428 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 21341864 is about 4619.7255329727. The cubic root of 21341864 is about 277.3814725258.

The spelling of 21341864 in words is "twenty-one million, three hundred forty-one thousand, eight hundred sixty-four".