121251251 has 4 divisors (see below), whose sum is σ = 132274104. Its totient is φ = 110228400.

The previous prime is 121251209. The next prime is 121251281. The reversal of 121251251 is 152152121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152152121 = 11 ⋅13832011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121251251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121251281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5511410 + ... + 5511431.

It is an arithmetic number, because the mean of its divisors is an integer number (33068526).

Almost surely, 2^121251251 is an apocalyptic number.

121251251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121251251 is a deficient number, since it is larger than the sum of its proper divisors (11022853).

121251251 is a wasteful number, since it uses less digits than its factorization.

121251251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11022852.

The product of its digits is 200, while the sum is 20.

The square root of 121251251 is about 11011.4145776099. The cubic root of 121251251 is about 494.9508518356.

The spelling of 121251251 in words is "one hundred twenty-one million, two hundred fifty-one thousand, two hundred fifty-one".