21040602 has 32 divisors (see below), whose sum is σ = 47494080. Its totient is φ = 6155520.

The previous prime is 21040601. The next prime is 21040627. The reversal of 21040602 is 20604012.

It is not an unprimeable number, because it can be changed into a prime (21040601) 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 15 ways as a sum of consecutive naturals, for example, 3583 + ... + 7410.

It is an arithmetic number, because the mean of its divisors is an integer number (1484190).

Almost surely, 2^21040602 is an apocalyptic number.

21040602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21040602 is an abundant number, since it is smaller than the sum of its proper divisors (26453478).

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

21040602 is a wasteful number, since it uses less digits than its factorization.

21040602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11038.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21040602 is about 4587.0035971209. The cubic root of 21040602 is about 276.0701092635.

Adding to 21040602 its reverse (20604012), we get a palindrome (41644614).

The spelling of 21040602 in words is "twenty-one million, forty thousand, six hundred two".