21212112322110 has 64 divisors (see below), whose sum is σ = 53971603052544. Its totient is φ = 5326145020800.

The previous prime is 21212112322081. The next prime is 21212112322111. The reversal of 21212112322110 is 1122321121212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212112322111) 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, 308191576 + ... + 308260395.

It is an arithmetic number, because the mean of its divisors is an integer number (843306297696).

Almost surely, 2^{21212112322110} is an apocalyptic number.

21212112322110 is an abundant number, since it is smaller than the sum of its proper divisors (32759490730434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212112322110 is a wasteful number, since it uses less digits than its factorization.

21212112322110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616452049.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21212112322110 its reverse (1122321121212), we get a palindrome (22334433443322).

The spelling of 21212112322110 in words is "twenty-one trillion, two hundred twelve billion, one hundred twelve million, three hundred twenty-two thousand, one hundred ten".