121551371 has 2 divisors, whose sum is σ = 121551372. Its totient is φ = 121551370.

The previous prime is 121551329. The next prime is 121551373. The reversal of 121551371 is 173155121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121551371 - 2⁶ = 121551307 is a prime.

Together with 121551373, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121551371.

It is not a weakly prime, because it can be changed into another prime (121551373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775685 + 60775686.

It is an arithmetic number, because the mean of its divisors is an integer number (60775686).

Almost surely, 2^121551371 is an apocalyptic number.

121551371 is a deficient number, since it is larger than the sum of its proper divisors (1).

121551371 is an equidigital number, since it uses as much as digits as its factorization.

121551371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1050, while the sum is 26.

The square root of 121551371 is about 11025.0338321476. The cubic root of 121551371 is about 495.3588813278.

The spelling of 121551371 in words is "one hundred twenty-one million, five hundred fifty-one thousand, three hundred seventy-one".