21301211204 has 72 divisors (see below), whose sum is σ = 47127853080. Its totient is φ = 8349433344.

The previous prime is 21301211179. The next prime is 21301211249. The reversal of 21301211204 is 40211210312.

It can be written as a sum of positive squares in 4 ways, for example, as 829324804 + 20471886400 = 28798^2 + 143080^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 239384 + ... + 316080.

It is an arithmetic number, because the mean of its divisors is an integer number (654553515).

Almost surely, 2^21301211204 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 21301211204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23563926540).

21301211204 is an abundant number, since it is smaller than the sum of its proper divisors (25826641876).

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

21301211204 is a wasteful number, since it uses less digits than its factorization.

21301211204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76837 (or 76828 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21301211204 its reverse (40211210312), we get a palindrome (61512421516).

The spelling of 21301211204 in words is "twenty-one billion, three hundred one million, two hundred eleven thousand, two hundred four".