1221121194131 has 2 divisors, whose sum is σ = 1221121194132. Its totient is φ = 1221121194130.

The previous prime is 1221121194103. The next prime is 1221121194149. The reversal of 1221121194131 is 1314911211221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221121194131 - 2¹⁴ = 1221121177747 is a prime.

It is a super-2 number, since 2×1221121194131² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221121194094 and 1221121194103.

It is not a weakly prime, because it can be changed into another prime (1221121194031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610560597065 + 610560597066.

It is an arithmetic number, because the mean of its divisors is an integer number (610560597066).

Almost surely, 2^{1221121194131} is an apocalyptic number.

1221121194131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221121194131 is an equidigital number, since it uses as much as digits as its factorization.

1221121194131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 29.

The spelling of 1221121194131 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred ninety-four thousand, one hundred thirty-one".