1221023303031 has 48 divisors (see below), whose sum is σ = 1981772745984. Its totient is φ = 665500340736.

The previous prime is 1221023303023. The next prime is 1221023303047. The reversal of 1221023303031 is 1303033201221.

It is not a de Polignac number, because 1221023303031 - 2³ = 1221023303023 is a prime.

It is a super-2 number, since 2×1221023303031² (a number of 25 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221023302989 and 1221023303007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221033303031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 681960 + ... + 1705026.

It is an arithmetic number, because the mean of its divisors is an integer number (41286932208).

Almost surely, 2^{1221023303031} is an apocalyptic number.

1221023303031 is a deficient number, since it is larger than the sum of its proper divisors (760749442953).

1221023303031 is a wasteful number, since it uses less digits than its factorization.

1221023303031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023460 (or 1023453 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 1221023303031 its reverse (1303033201221), we get a palindrome (2524056504252).

The spelling of 1221023303031 in words is "one trillion, two hundred twenty-one billion, twenty-three million, three hundred three thousand, thirty-one".