21112671204 has 81 divisors (see below), whose sum is σ = 54394383771. Its totient is φ = 6904751040.

The previous prime is 21112671197. The next prime is 21112671233. The reversal of 21112671204 is 40217621112.

The square root of 21112671204 is 145302.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3675996900 + 17436674304 = 60630^2 + 132048^2 .

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 53180334 + ... + 53180730.

Almost surely, 2^21112671204 is an apocalyptic number.

21112671204 is the 145302-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112671204

21112671204 is an abundant number, since it is smaller than the sum of its proper divisors (33281712567).

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

21112671204 is an equidigital number, since it uses as much as digits as its factorization.

21112671204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The spelling of 21112671204 in words is "twenty-one billion, one hundred twelve million, six hundred seventy-one thousand, two hundred four".