121285253240 has 64 divisors (see below), whose sum is σ = 289424957760. Its totient is φ = 45644037120.

The previous prime is 121285253233. The next prime is 121285253273. The reversal of 121285253240 is 42352582121.

It is a super-3 number, since 3×121285253240³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 121285253240.

It is a congruent number.

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, 1024469 + ... + 1136708.

It is an arithmetic number, because the mean of its divisors is an integer number (4522264965).

Almost surely, 2^121285253240 is an apocalyptic number.

121285253240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121285253240 is an abundant number, since it is smaller than the sum of its proper divisors (168139704520).

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

121285253240 is a wasteful number, since it uses less digits than its factorization.

121285253240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161272 (or 2161268 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 121285253240 in words is "one hundred twenty-one billion, two hundred eighty-five million, two hundred fifty-three thousand, two hundred forty".