121220351 has 4 divisors (see below), whose sum is σ = 138537552. Its totient is φ = 103903152.

The previous prime is 121220339. The next prime is 121220383. The reversal of 121220351 is 153022121.

It is a happy number.

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 121220351 - 2⁶ = 121220287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8658590 + ... + 8658603.

It is an arithmetic number, because the mean of its divisors is an integer number (34634388).

Almost surely, 2^121220351 is an apocalyptic number.

121220351 is a deficient number, since it is larger than the sum of its proper divisors (17317201).

121220351 is an equidigital number, since it uses as much as digits as its factorization.

121220351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17317200.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 121220351 is about 11010.0113987225. The cubic root of 121220351 is about 494.9088033878.

Adding to 121220351 its reverse (153022121), we get a palindrome (274242472).

The spelling of 121220351 in words is "one hundred twenty-one million, two hundred twenty thousand, three hundred fifty-one".