21212323310 has 8 divisors (see below), whose sum is σ = 38182181976. Its totient is φ = 8484929320.

The previous prime is 21212323271. The next prime is 21212323333. The reversal of 21212323310 is 1332321212.

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

It is a super-2 number, since 2×21212323310² (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 3 ways as a sum of consecutive naturals, for example, 1060616156 + ... + 1060616175.

It is an arithmetic number, because the mean of its divisors is an integer number (4772772747).

Almost surely, 2^21212323310 is an apocalyptic number.

21212323310 is a deficient number, since it is larger than the sum of its proper divisors (16969858666).

21212323310 is a wasteful number, since it uses less digits than its factorization.

21212323310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121232338.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21212323310 its reverse (1332321212), we get a palindrome (22544644522).

The spelling of 21212323310 in words is "twenty-one billion, two hundred twelve million, three hundred twenty-three thousand, three hundred ten".