1221320110131 has 40 divisors (see below), whose sum is σ = 1993068633600. Its totient is φ = 739164141360.

The previous prime is 1221320110069. The next prime is 1221320110193. The reversal of 1221320110131 is 1310110231221.

1221320110131 is a `hidden beast` number, since 1 + 221 + 320 + 110 + 13 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1221320110069) and next prime (1221320110193).

It is not a de Polignac number, because 1221320110131 - 2¹⁷ = 1221319979059 is a prime.

It is a super-2 number, since 2×1221320110131² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221320110631) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 312591 + ... + 1593848.

It is an arithmetic number, because the mean of its divisors is an integer number (49826715840).

Almost surely, 2^{1221320110131} is an apocalyptic number.

1221320110131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221320110131 is a deficient number, since it is larger than the sum of its proper divisors (771748523469).

1221320110131 is a wasteful number, since it uses less digits than its factorization.

1221320110131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907181 (or 1907172 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1221320110131 its reverse (1310110231221), we get a palindrome (2531430341352).

The spelling of 1221320110131 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, one hundred ten thousand, one hundred thirty-one".