121121251 has 2 divisors, whose sum is σ = 121121252. Its totient is φ = 121121250.

The previous prime is 121121249. The next prime is 121121269. The reversal of 121121251 is 152121121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121121251 - 2¹ = 121121249 is a prime.

Together with 121121249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60560625 + 60560626.

It is an arithmetic number, because the mean of its divisors is an integer number (60560626).

Almost surely, 2^121121251 is an apocalyptic number.

121121251 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121251 is an equidigital number, since it uses as much as digits as its factorization.

121121251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40, while the sum is 16.

The square root of 121121251 is about 11005.5100290718. The cubic root of 121121251 is about 494.7739007544.

Adding to 121121251 its reverse (152121121), we get a palindrome (273242372).

The spelling of 121121251 in words is "one hundred twenty-one million, one hundred twenty-one thousand, two hundred fifty-one".