21062004 has 36 divisors (see below), whose sum is σ = 50922144. Its totient is φ = 6775328.

The previous prime is 21062003. The next prime is 21062017. The reversal of 21062004 is 40026012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9049 + ... + 11135.

It is an arithmetic number, because the mean of its divisors is an integer number (1414504).

Almost surely, 2^21062004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21062004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25461072).

21062004 is an abundant number, since it is smaller than the sum of its proper divisors (29860140).

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

21062004 is a wasteful number, since it uses less digits than its factorization.

21062004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152 (or 2121 counting only the distinct ones).

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

The square root of 21062004 is about 4589.3358996700. The cubic root of 21062004 is about 276.1636815276.

Adding to 21062004 its reverse (40026012), we get a palindrome (61088016).

The spelling of 21062004 in words is "twenty-one million, sixty-two thousand, four".