121255290 has 96 divisors (see below), whose sum is σ = 348815376. Its totient is φ = 29030400.

The previous prime is 121255279. The next prime is 121255301. The reversal of 121255290 is 92552121.

121255290 is a `hidden beast` number, since 1 + 21 + 2 + 552 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (121255279) and next prime (121255301).

It can be written as a sum of positive squares in 8 ways, for example, as 56565441 + 64689849 = 7521^2 + 8043^2 .

It is a super-3 number, since 3×121255290³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41890 + ... + 44690.

Almost surely, 2^121255290 is an apocalyptic number.

121255290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121255290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174407688).

121255290 is an abundant number, since it is smaller than the sum of its proper divisors (227560086).

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

121255290 is a wasteful number, since it uses less digits than its factorization.

121255290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864 (or 2861 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 121255290 is about 11011.5979766790. The cubic root of 121255290 is about 494.9563475433.

The spelling of 121255290 in words is "one hundred twenty-one million, two hundred fifty-five thousand, two hundred ninety".