121021451 has 2 divisors, whose sum is σ = 121021452. Its totient is φ = 121021450.

The previous prime is 121021447. The next prime is 121021457. The reversal of 121021451 is 154120121.

It is a weak prime.

It is an emirp because it is prime and its reverse (154120121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121021451 - 2² = 121021447 is a prime.

It is not a weakly prime, because it can be changed into another prime (121021457) 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 as a sum of consecutive naturals, namely, 60510725 + 60510726.

It is an arithmetic number, because the mean of its divisors is an integer number (60510726).

Almost surely, 2^121021451 is an apocalyptic number.

121021451 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021451 is an equidigital number, since it uses as much as digits as its factorization.

121021451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 121021451 is about 11000.9750022441. The cubic root of 121021451 is about 494.6379708407.

Adding to 121021451 its reverse (154120121), we get a palindrome (275141572).

The spelling of 121021451 in words is "one hundred twenty-one million, twenty-one thousand, four hundred fifty-one".