121232011421 has 2 divisors, whose sum is σ = 121232011422. Its totient is φ = 121232011420.

The previous prime is 121232011367. The next prime is 121232011493. The reversal of 121232011421 is 124110232121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121200763321 + 31248100 = 348139^2 + 5590^2 .

It is a cyclic number.

It is not a de Polignac number, because 121232011421 - 2¹⁴ = 121231995037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121232011393 and 121232011402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121232011321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60616005710 + 60616005711.

It is an arithmetic number, because the mean of its divisors is an integer number (60616005711).

Almost surely, 2^121232011421 is an apocalyptic number.

It is an amenable number.

121232011421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121232011421 is an equidigital number, since it uses as much as digits as its factorization.

121232011421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 121232011421 its reverse (124110232121), we get a palindrome (245342243542).

The spelling of 121232011421 in words is "one hundred twenty-one billion, two hundred thirty-two million, eleven thousand, four hundred twenty-one".