121157772 has 12 divisors (see below), whose sum is σ = 282701496. Its totient is φ = 40385920.

The previous prime is 121157741. The next prime is 121157791. The reversal of 121157772 is 277751121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×121157772³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5048229 + ... + 5048252.

It is an arithmetic number, because the mean of its divisors is an integer number (23558458).

Almost surely, 2^121157772 is an apocalyptic number.

121157772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121157772 is an abundant number, since it is smaller than the sum of its proper divisors (161543724).

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

121157772 is a wasteful number, since it uses less digits than its factorization.

121157772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10096488 (or 10096486 counting only the distinct ones).

The product of its digits is 6860, while the sum is 33.

The square root of 121157772 is about 11007.1691183519. The cubic root of 121157772 is about 494.8236245412.

The spelling of 121157772 in words is "one hundred twenty-one million, one hundred fifty-seven thousand, seven hundred seventy-two".