221313121302 has 64 divisors (see below), whose sum is σ = 546796293120. Its totient is φ = 58151274624.

The previous prime is 221313121301. The next prime is 221313121319. The reversal of 221313121302 is 203121313122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221313121301) 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, 606538 + ... + 900285.

It is an arithmetic number, because the mean of its divisors is an integer number (8543692080).

Almost surely, 2^221313121302 is an apocalyptic number.

221313121302 is an abundant number, since it is smaller than the sum of its proper divisors (325483171818).

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

221313121302 is a wasteful number, since it uses less digits than its factorization.

221313121302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507117.

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

Adding to 221313121302 its reverse (203121313122), we get a palindrome (424434434424).

The spelling of 221313121302 in words is "two hundred twenty-one billion, three hundred thirteen million, one hundred twenty-one thousand, three hundred two".