21321231010 has 8 divisors (see below), whose sum is σ = 38378215836. Its totient is φ = 8528492400.

The previous prime is 21321230999. The next prime is 21321231031. The reversal of 21321231010 is 1013212312.

It can be written as a sum of positive squares in 2 ways, for example, as 21167049121 + 154181889 = 145489^2 + 12417^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066061541 + ... + 1066061560.

Almost surely, 2^21321231010 is an apocalyptic number.

21321231010 is a deficient number, since it is larger than the sum of its proper divisors (17056984826).

21321231010 is a wasteful number, since it uses less digits than its factorization.

21321231010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132123108.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21321231010 its reverse (1013212312), we get a palindrome (22334443322).

The spelling of 21321231010 in words is "twenty-one billion, three hundred twenty-one million, two hundred thirty-one thousand, ten".