21067941904 has 45 divisors (see below), whose sum is σ = 41282143581. Its totient is φ = 10415820480.

The previous prime is 21067941877. The next prime is 21067941913. The reversal of 21067941904 is 40914976012.

The square root of 21067941904 is 145148.

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

It can be written as a sum of positive squares in only one way, i.e., 3631267600 + 17436674304 = 60260^2 + 132048^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 76057414 + ... + 76057690.

Almost surely, 2^21067941904 is an apocalyptic number.

21067941904 is the 145148-th square number.

It is an amenable number.

21067941904 is a deficient number, since it is larger than the sum of its proper divisors (20214201677).

21067941904 is an frugal number, since it uses more digits than its factorization.

21067941904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 21067941904 in words is "twenty-one billion, sixty-seven million, nine hundred forty-one thousand, nine hundred four".