21243331210 has 16 divisors (see below), whose sum is σ = 38959468776. Its totient is φ = 8337005248.

The previous prime is 21243331181. The next prime is 21243331211. The reversal of 21243331210 is 1213334212.

It can be written as a sum of positive squares in 4 ways, for example, as 21207223129 + 36108081 = 145627^2 + 6009^2 .

It is not an unprimeable number, because it can be changed into a prime (21243331211) 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, 20040349 + ... + 20041408.

Almost surely, 2^21243331210 is an apocalyptic number.

21243331210 is a deficient number, since it is larger than the sum of its proper divisors (17716137566).

21243331210 is a wasteful number, since it uses less digits than its factorization.

21243331210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40081817.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21243331210 its reverse (1213334212), we get a palindrome (22456665422).

The spelling of 21243331210 in words is "twenty-one billion, two hundred forty-three million, three hundred thirty-one thousand, two hundred ten".