121201023421 has 4 divisors (see below), whose sum is σ = 121588247452. Its totient is φ = 120813799392.

The previous prime is 121201023407. The next prime is 121201023481. The reversal of 121201023421 is 124320102121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 801739225 + 120399284196 = 28315^2 + 346986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201023421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201023481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193611546 + ... + 193612171.

It is an arithmetic number, because the mean of its divisors is an integer number (30397061863).

Almost surely, 2^121201023421 is an apocalyptic number.

It is an amenable number.

121201023421 is a deficient number, since it is larger than the sum of its proper divisors (387224031).

121201023421 is an equidigital number, since it uses as much as digits as its factorization.

121201023421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387224030.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 121201023421 its reverse (124320102121), we get a palindrome (245521125542).

The spelling of 121201023421 in words is "one hundred twenty-one billion, two hundred one million, twenty-three thousand, four hundred twenty-one".