121555266 has 32 divisors (see below), whose sum is σ = 281760768. Its totient is φ = 34240080.

The previous prime is 121555229. The next prime is 121555267. The reversal of 121555266 is 662555121.

It is not an unprimeable number, because it can be changed into a prime (121555267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17400 + ... + 23363.

It is an arithmetic number, because the mean of its divisors is an integer number (8805024).

Almost surely, 2^121555266 is an apocalyptic number.

121555266 is an abundant number, since it is smaller than the sum of its proper divisors (160205502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121555266 is a wasteful number, since it uses less digits than its factorization.

121555266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40846.

The product of its digits is 18000, while the sum is 33.

The square root of 121555266 is about 11025.2104741814. The cubic root of 121555266 is about 495.3641723753.

The spelling of 121555266 in words is "one hundred twenty-one million, five hundred fifty-five thousand, two hundred sixty-six".