21341064 has 16 divisors (see below), whose sum is σ = 53352720. Its totient is φ = 7113680.

The previous prime is 21341063. The next prime is 21341077. The reversal of 21341064 is 46014312.

It is a self number, because there is not a number n which added to its sum of digits gives 21341064.

It is not an unprimeable number, because it can be changed into a prime (21341063) 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, 444582 + ... + 444629.

It is an arithmetic number, because the mean of its divisors is an integer number (3334545).

Almost surely, 2^21341064 is an apocalyptic number.

21341064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21341064 is an abundant number, since it is smaller than the sum of its proper divisors (32011656).

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

21341064 is a wasteful number, since it uses less digits than its factorization.

21341064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889220 (or 889216 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21341064 is about 4619.6389469308. The cubic root of 21341064 is about 277.3780066000.

Adding to 21341064 its reverse (46014312), we get a palindrome (67355376).

The spelling of 21341064 in words is "twenty-one million, three hundred forty-one thousand, sixty-four".