21223231010 has 16 divisors (see below), whose sum is σ = 38218232376. Its totient is φ = 8485644288.

The previous prime is 21223230949. The next prime is 21223231019. The reversal of 21223231010 is 1013232212.

It can be written as a sum of positive squares in 4 ways, for example, as 18309066721 + 2914164289 = 135311^2 + 53983^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21223231010.

It is not an unprimeable number, because it can be changed into a prime (21223231019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431519 + ... + 478178.

Almost surely, 2^21223231010 is an apocalyptic number.

21223231010 is a deficient number, since it is larger than the sum of its proper divisors (16995001366).

21223231010 is a wasteful number, since it uses less digits than its factorization.

21223231010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912037.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21223231010 its reverse (1013232212), we get a palindrome (22236463222).

The spelling of 21223231010 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty-one thousand, ten".