221312213310 has 32 divisors (see below), whose sum is σ = 531161763840. Its totient is φ = 59015206688.

The previous prime is 221312213267. The next prime is 221312213323. The reversal of 221312213310 is 13312213122.

It is a super-2 number, since 2×221312213310² (a number of 23 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 15 ways as a sum of consecutive naturals, for example, 2245651 + ... + 2342129.

It is an arithmetic number, because the mean of its divisors is an integer number (16598805120).

Almost surely, 2^221312213310 is an apocalyptic number.

221312213310 is an abundant number, since it is smaller than the sum of its proper divisors (309849550530).

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

221312213310 is a wasteful number, since it uses less digits than its factorization.

221312213310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172952.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221312213310 its reverse (13312213122), we get a palindrome (234624426432).

It can be divided in two parts, 22131221 and 3310, that added together give a triangular number (22134531 = T₆₆₅₃).

The spelling of 221312213310 in words is "two hundred twenty-one billion, three hundred twelve million, two hundred thirteen thousand, three hundred ten".