21047004290 has 16 divisors (see below), whose sum is σ = 40798808568. Its totient is φ = 7771201536.

The previous prime is 21047004287. The next prime is 21047004299. The reversal of 21047004290 is 9240074012.

It can be written as a sum of positive squares in 4 ways, for example, as 6250957969 + 14796046321 = 79063^2 + 121639^2 .

It is not an unprimeable number, because it can be changed into a prime (21047004299) 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 7 ways as a sum of consecutive naturals, for example, 80949887 + ... + 80950146.

Almost surely, 2^21047004290 is an apocalyptic number.

21047004290 is a deficient number, since it is larger than the sum of its proper divisors (19751804278).

21047004290 is a wasteful number, since it uses less digits than its factorization.

21047004290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161900053.

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 21047004290 in words is "twenty-one billion, forty-seven million, four thousand, two hundred ninety".