121012156 has 24 divisors (see below), whose sum is σ = 219201696. Its totient is φ = 58414080.

The previous prime is 121012141. The next prime is 121012183. The reversal of 121012156 is 651210121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12105 + ... + 19711.

It is an arithmetic number, because the mean of its divisors is an integer number (9133404).

Almost surely, 2^121012156 is an apocalyptic number.

It is an amenable number.

121012156 is a deficient number, since it is larger than the sum of its proper divisors (98189540).

121012156 is a wasteful number, since it uses less digits than its factorization.

121012156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7749 (or 7747 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 121012156 is about 11000.5525315777. The cubic root of 121012156 is about 494.6253070317.

Adding to 121012156 its reverse (651210121), we get a palindrome (772222277).

It can be divided in two parts, 1210121 and 56, that multiplied together give a palindrome (67766776).

The spelling of 121012156 in words is "one hundred twenty-one million, twelve thousand, one hundred fifty-six".