1231231120221 has 16 divisors (see below), whose sum is σ = 1738324787904. Its totient is φ = 772485552384.

The previous prime is 1231231120219. The next prime is 1231231120277. The reversal of 1231231120221 is 1220211321321.

It is not a de Polignac number, because 1231231120221 - 2¹ = 1231231120219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231231125221) 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, 28570 + ... + 1569483.

It is an arithmetic number, because the mean of its divisors is an integer number (108645299244).

Almost surely, 2^{1231231120221} is an apocalyptic number.

It is an amenable number.

1231231120221 is a deficient number, since it is larger than the sum of its proper divisors (507093667683).

1231231120221 is a wasteful number, since it uses less digits than its factorization.

1231231120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613180.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1231231120221 its reverse (1220211321321), we get a palindrome (2451442441542).

The spelling of 1231231120221 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-one million, one hundred twenty thousand, two hundred twenty-one".