21000532223 has 32 divisors (see below), whose sum is σ = 23701773312. Its totient is φ = 18441561600.

The previous prime is 21000532171. The next prime is 21000532229. The reversal of 21000532223 is 32223500012.

It is not a de Polignac number, because 21000532223 - 2⁸ = 21000531967 is a prime.

It is a super-2 number, since 2×21000532223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000532195 and 21000532204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000532229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34036211 + ... + 34036827.

It is an arithmetic number, because the mean of its divisors is an integer number (740680416).

Almost surely, 2^21000532223 is an apocalyptic number.

21000532223 is a deficient number, since it is larger than the sum of its proper divisors (2701241089).

21000532223 is a wasteful number, since it uses less digits than its factorization.

21000532223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295.

The product of its (nonzero) digits is 720, while the sum is 20.

The spelling of 21000532223 in words is "twenty-one billion, five hundred thirty-two thousand, two hundred twenty-three".