121131232011421 has 2 divisors, whose sum is σ = 121131232011422. Its totient is φ = 121131232011420.

The previous prime is 121131232011287. The next prime is 121131232011437. The reversal of 121131232011421 is 124110232131121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106192736460196 + 14938495551225 = 10304986^2 + 3865035^2 .

It is a cyclic number.

It is not a de Polignac number, because 121131232011421 - 2⁴⁵ = 85946859922589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121131232011721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60565616005710 + 60565616005711.

It is an arithmetic number, because the mean of its divisors is an integer number (60565616005711).

Almost surely, 2^{121131232011421} is an apocalyptic number.

It is an amenable number.

121131232011421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121131232011421 is an equidigital number, since it uses as much as digits as its factorization.

121131232011421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 121131232011421 its reverse (124110232131121), we get a palindrome (245241464142542).

The spelling of 121131232011421 in words is "one hundred twenty-one trillion, one hundred thirty-one billion, two hundred thirty-two million, eleven thousand, four hundred twenty-one".