121221031 has 2 divisors, whose sum is σ = 121221032. Its totient is φ = 121221030.

The previous prime is 121221029. The next prime is 121221041. The reversal of 121221031 is 130122121.

It is a weak prime.

It is an emirp because it is prime and its reverse (130122121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121221031 - 2¹ = 121221029 is a prime.

It is a super-2 number, since 2×121221031² = 29389076713405922, which contains 22 as substring.

Together with 121221029, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610515 + 60610516.

It is an arithmetic number, because the mean of its divisors is an integer number (60610516).

Almost surely, 2^121221031 is an apocalyptic number.

121221031 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221031 is an equidigital number, since it uses as much as digits as its factorization.

121221031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121221031 is about 11010.0422796645. The cubic root of 121221031 is about 494.9097288027.

Adding to 121221031 its reverse (130122121), we get a palindrome (251343152).

The spelling of 121221031 in words is "one hundred twenty-one million, two hundred twenty-one thousand, thirty-one".