1221431230311 has 16 divisors (see below), whose sum is σ = 1630070507520. Its totient is φ = 813540048480.

The previous prime is 1221431230309. The next prime is 1221431230451. The reversal of 1221431230311 is 1130321341221.

It is not a de Polignac number, because 1221431230311 - 2¹ = 1221431230309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221431230511) 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, 15750450 + ... + 15827808.

It is an arithmetic number, because the mean of its divisors is an integer number (101879406720).

Almost surely, 2^{1221431230311} is an apocalyptic number.

1221431230311 is a deficient number, since it is larger than the sum of its proper divisors (408639277209).

1221431230311 is a wasteful number, since it uses less digits than its factorization.

1221431230311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82126.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 1221431230311 its reverse (1130321341221), we get a palindrome (2351752571532).

The spelling of 1221431230311 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-one million, two hundred thirty thousand, three hundred eleven".