121670251 has 2 divisors, whose sum is σ = 121670252. Its totient is φ = 121670250.

The previous prime is 121670233. The next prime is 121670267. The reversal of 121670251 is 152076121.

It is a strong prime.

It is an emirp because it is prime and its reverse (152076121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121670251 - 2⁷ = 121670123 is a prime.

It is not a weakly prime, because it can be changed into another prime (121670551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60835125 + 60835126.

It is an arithmetic number, because the mean of its divisors is an integer number (60835126).

Almost surely, 2^121670251 is an apocalyptic number.

121670251 is a deficient number, since it is larger than the sum of its proper divisors (1).

121670251 is an equidigital number, since it uses as much as digits as its factorization.

121670251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 121670251 is about 11030.4238812477. The cubic root of 121670251 is about 495.5203194526.

The spelling of 121670251 in words is "one hundred twenty-one million, six hundred seventy thousand, two hundred fifty-one".