1221323013031 has 4 divisors (see below), whose sum is σ = 1332352377864. Its totient is φ = 1110293648200.

The previous prime is 1221323013007. The next prime is 1221323013037. The reversal of 1221323013031 is 1303103231221.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1221323013031 - 2²¹ = 1221320915879 is a prime.

It is a super-2 number, since 2×1221323013031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221323012993 and 1221323013011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221323013037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55514682400 + ... + 55514682421.

It is an arithmetic number, because the mean of its divisors is an integer number (333088094466).

Almost surely, 2^{1221323013031} is an apocalyptic number.

1221323013031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221323013031 is a deficient number, since it is larger than the sum of its proper divisors (111029364833).

1221323013031 is a wasteful number, since it uses less digits than its factorization.

1221323013031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111029364832.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1221323013031 its reverse (1303103231221), we get a palindrome (2524426244252).

The spelling of 1221323013031 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three million, thirteen thousand, thirty-one".