21212112310 has 16 divisors (see below), whose sum is σ = 38206011600. Its totient is φ = 8479465056.

The previous prime is 21212112209. The next prime is 21212112401. The reversal of 21212112310 is 1321121212.

It is a super-2 number, since 2×21212112310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655905 + ... + 687484.

It is an arithmetic number, because the mean of its divisors is an integer number (2387875725).

Almost surely, 2^21212112310 is an apocalyptic number.

21212112310 is a deficient number, since it is larger than the sum of its proper divisors (16993899290).

21212112310 is a wasteful number, since it uses less digits than its factorization.

21212112310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344975.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21212112310 its reverse (1321121212), we get a palindrome (22533233522).

The spelling of 21212112310 in words is "twenty-one billion, two hundred twelve million, one hundred twelve thousand, three hundred ten".