1221323002311 has 16 divisors (see below), whose sum is σ = 1636425609984. Its totient is φ = 810224696064.

The previous prime is 1221323002301. The next prime is 1221323002363. The reversal of 1221323002311 is 1132003231221.

It is not a de Polignac number, because 1221323002311 - 2⁵ = 1221323002279 is a prime.

It is a super-2 number, since 2×1221323002311² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221323002301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137706 + ... + 1568951.

It is an arithmetic number, because the mean of its divisors is an integer number (102276600624).

Almost surely, 2^{1221323002311} is an apocalyptic number.

1221323002311 is a deficient number, since it is larger than the sum of its proper divisors (415102607673).

1221323002311 is a wasteful number, since it uses less digits than its factorization.

1221323002311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707830.

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

Adding to 1221323002311 its reverse (1132003231221), we get a palindrome (2353326233532).

The spelling of 1221323002311 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three million, two thousand, three hundred eleven".