21020873206 has 8 divisors (see below), whose sum is σ = 31532224464. Its totient is φ = 10510131720.

The previous prime is 21020873189. The next prime is 21020873221. The reversal of 21020873206 is 60237802012.

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

It is a super-2 number, since 2×21020873206² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53385 + ... + 211876.

It is an arithmetic number, because the mean of its divisors is an integer number (3941528058).

Almost surely, 2^21020873206 is an apocalyptic number.

21020873206 is a deficient number, since it is larger than the sum of its proper divisors (10511351258).

21020873206 is a wasteful number, since it uses less digits than its factorization.

21020873206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304886.

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 21020873206 in words is "twenty-one billion, twenty million, eight hundred seventy-three thousand, two hundred six".