21004104030 has 128 divisors (see below), whose sum is σ = 62969453568. Its totient is φ = 4365453312.

The previous prime is 21004104029. The next prime is 21004104031. The reversal of 21004104030 is 3040140012.

It is an interprime number because it is at equal distance from previous prime (21004104029) and next prime (21004104031).

It is a super-2 number, since 2×21004104030² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004104031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125494 + ... + 240326.

It is an arithmetic number, because the mean of its divisors is an integer number (491948856).

Almost surely, 2^21004104030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21004104030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31484726784).

21004104030 is an abundant number, since it is smaller than the sum of its proper divisors (41965349538).

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

21004104030 is a wasteful number, since it uses less digits than its factorization.

21004104030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114930.

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

Adding to 21004104030 its reverse (3040140012), we get a palindrome (24044244042).

The spelling of 21004104030 in words is "twenty-one billion, four million, one hundred four thousand, thirty".