121210051 has 4 divisors (see below), whose sum is σ = 128340072. Its totient is φ = 114080032.

The previous prime is 121210049. The next prime is 121210081. The reversal of 121210051 is 150012121.

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

It is a cyclic number.

It is not a de Polignac number, because 121210051 - 2¹ = 121210049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121210021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3564985 + ... + 3565018.

It is an arithmetic number, because the mean of its divisors is an integer number (32085018).

Almost surely, 2^121210051 is an apocalyptic number.

121210051 is a deficient number, since it is larger than the sum of its proper divisors (7130021).

121210051 is an equidigital number, since it uses as much as digits as its factorization.

121210051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7130020.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 121210051 is about 11009.5436326852. The cubic root of 121210051 is about 494.8947856506.

Adding to 121210051 its reverse (150012121), we get a palindrome (271222172).

The spelling of 121210051 in words is "one hundred twenty-one million, two hundred ten thousand, fifty-one".