21000532215 has 16 divisors (see below), whose sum is σ = 36185532768. Its totient is φ = 10338723456.

The previous prime is 21000532171. The next prime is 21000532229. The reversal of 21000532215 is 51223500012.

It is not a de Polignac number, because 21000532215 - 2¹⁵ = 21000499447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000532191 and 21000532200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53847324 + ... + 53847713.

It is an arithmetic number, because the mean of its divisors is an integer number (2261595798).

Almost surely, 2^21000532215 is an apocalyptic number.

21000532215 is a deficient number, since it is larger than the sum of its proper divisors (15185000553).

21000532215 is a wasteful number, since it uses less digits than its factorization.

21000532215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107695058.

The product of its (nonzero) digits is 600, while the sum is 21.

The spelling of 21000532215 in words is "twenty-one billion, five hundred thirty-two thousand, two hundred fifteen".