121322551 has 4 divisors (see below), whose sum is σ = 138654352. Its totient is φ = 103990752.

The previous prime is 121322549. The next prime is 121322587. The reversal of 121322551 is 155223121.

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 121322551 - 2¹ = 121322549 is a prime.

It is a super-2 number, since 2×121322551² = 29438322762295202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121322501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8665890 + ... + 8665903.

It is an arithmetic number, because the mean of its divisors is an integer number (34663588).

Almost surely, 2^121322551 is an apocalyptic number.

121322551 is a deficient number, since it is larger than the sum of its proper divisors (17331801).

121322551 is an equidigital number, since it uses as much as digits as its factorization.

121322551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17331800.

The product of its digits is 600, while the sum is 22.

The square root of 121322551 is about 11014.6516513233. The cubic root of 121322551 is about 495.0478489949.

Adding to 121322551 its reverse (155223121), we get a palindrome (276545672).

The spelling of 121322551 in words is "one hundred twenty-one million, three hundred twenty-two thousand, five hundred fifty-one".