121212156 has 24 divisors (see below), whose sum is σ = 304584784. Its totient is φ = 37296000.

The previous prime is 121212131. The next prime is 121212163. The reversal of 121212156 is 651212121.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388345 + ... + 388656.

Almost surely, 2^121212156 is an apocalyptic number.

It is an amenable number.

121212156 is an abundant number, since it is smaller than the sum of its proper divisors (183372628).

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

121212156 is a wasteful number, since it uses less digits than its factorization.

121212156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777021 (or 777019 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 121212156 is about 11009.6392311465. The cubic root of 121212156 is about 494.8976505052.

Adding to 121212156 its reverse (651212121), we get a palindrome (772424277).

The spelling of 121212156 in words is "one hundred twenty-one million, two hundred twelve thousand, one hundred fifty-six".