1221012303231 has 16 divisors (see below), whose sum is σ = 1861419757824. Its totient is φ = 697410223104.

The previous prime is 1221012303229. The next prime is 1221012303233. The reversal of 1221012303231 is 1323032101221.

It is an interprime number because it is at equal distance from previous prime (1221012303229) and next prime (1221012303233).

It is not a de Polignac number, because 1221012303231 - 2¹ = 1221012303229 is a prime.

It is a super-2 number, since 2×1221012303231² (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 = 1221012303198 and 1221012303207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012303233) 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 15 ways as a sum of consecutive naturals, for example, 12913986 + ... + 13008191.

It is an arithmetic number, because the mean of its divisors is an integer number (116338734864).

Almost surely, 2^{1221012303231} is an apocalyptic number.

1221012303231 is a deficient number, since it is larger than the sum of its proper divisors (640407454593).

1221012303231 is a wasteful number, since it uses less digits than its factorization.

1221012303231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25924430.

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

Adding to 1221012303231 its reverse (1323032101221), we get a palindrome (2544044404452).

The spelling of 1221012303231 in words is "one trillion, two hundred twenty-one billion, twelve million, three hundred three thousand, two hundred thirty-one".