121552210 has 32 divisors (see below), whose sum is σ = 249489072. Its totient is φ = 42240000.

The previous prime is 121552183. The next prime is 121552241. The reversal of 121552210 is 12255121.

It can be written as a sum of positive squares in 8 ways, for example, as 13329801 + 108222409 = 3651^2 + 10403^2 .

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25291 + ... + 29710.

Almost surely, 2^121552210 is an apocalyptic number.

121552210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121552210 is an abundant number, since it is smaller than the sum of its proper divisors (127936862).

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

121552210 is a wasteful number, since it uses less digits than its factorization.

121552210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55038.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 121552210 is about 11025.0718818518. The cubic root of 121552210 is about 495.3600210520.

It can be divided in two parts, 12155 and 2210, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 121552210 in words is "one hundred twenty-one million, five hundred fifty-two thousand, two hundred ten".