1221320440302 has 64 divisors (see below), whose sum is σ = 2517034298688. Its totient is φ = 394827264000.

The previous prime is 1221320440283. The next prime is 1221320440303. The reversal of 1221320440302 is 2030440231221.

It is a happy number.

It is a super-3 number, since 3×1221320440302³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221320440303) 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, 180638602 + ... + 180645362.

It is an arithmetic number, because the mean of its divisors is an integer number (39328660917).

Almost surely, 2^{1221320440302} is an apocalyptic number.

1221320440302 is an abundant number, since it is smaller than the sum of its proper divisors (1295713858386).

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

1221320440302 is a wasteful number, since it uses less digits than its factorization.

1221320440302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11045.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 1221320440302 its reverse (2030440231221), we get a palindrome (3251760671523).

The spelling of 1221320440302 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, four hundred forty thousand, three hundred two".