221220001310 has 64 divisors (see below), whose sum is σ = 496765785600. Its totient is φ = 68908129920.

The previous prime is 221220001279. The next prime is 221220001313. The reversal of 221220001310 is 13100022122.

It is a happy number.

It is a super-2 number, since 2×221220001310² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220001313) 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, 1139741 + ... + 1319639.

It is an arithmetic number, because the mean of its divisors is an integer number (7761965400).

Almost surely, 2^221220001310 is an apocalyptic number.

221220001310 is an abundant number, since it is smaller than the sum of its proper divisors (275545784290).

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

221220001310 is a wasteful number, since it uses less digits than its factorization.

221220001310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181521.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 221220001310 its reverse (13100022122), we get a palindrome (234320023432).

The spelling of 221220001310 in words is "two hundred twenty-one billion, two hundred twenty million, one thousand, three hundred ten".