21000704413 has 8 divisors (see below), whose sum is σ = 22617296856. Its totient is φ = 19384276800.

The previous prime is 21000704393. The next prime is 21000704479. The reversal of 21000704413 is 31440700012.

It can be written as a sum of positive squares in 4 ways, for example, as 2710035364 + 18290669049 = 52058^2 + 135243^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000704413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000704513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392703 + ... + 442963.

It is an arithmetic number, because the mean of its divisors is an integer number (2827162107).

Almost surely, 2^21000704413 is an apocalyptic number.

It is an amenable number.

21000704413 is a deficient number, since it is larger than the sum of its proper divisors (1616592443).

21000704413 is a wasteful number, since it uses less digits than its factorization.

21000704413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82415.

The product of its (nonzero) digits is 672, while the sum is 22.

The spelling of 21000704413 in words is "twenty-one billion, seven hundred four thousand, four hundred thirteen".