1212120657 has 24 divisors (see below), whose sum is σ = 1927548480. Its totient is φ = 727872480.

The previous prime is 1212120643. The next prime is 1212120659. The reversal of 1212120657 is 7560212121.

1212120657 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 1 + 2 + 0 + 657 = 666.

It is not a de Polignac number, because 1212120657 - 2⁴ = 1212120641 is a prime.

It is a super-2 number, since 2×1212120657² = 2938472974252223298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212120657.

It is not an unprimeable number, because it can be changed into a prime (1212120659) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 45373 + ... + 66954.

It is an arithmetic number, because the mean of its divisors is an integer number (80314520).

Almost surely, 2^1212120657 is an apocalyptic number.

It is an amenable number.

1212120657 is a deficient number, since it is larger than the sum of its proper divisors (715427823).

1212120657 is a wasteful number, since it uses less digits than its factorization.

1212120657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112453 (or 112450 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 1212120657 is about 34815.5232188172. The cubic root of 1212120657 is about 1066.2244014933.

Adding to 1212120657 its reverse (7560212121), we get a palindrome (8772332778).

The spelling of 1212120657 in words is "one billion, two hundred twelve million, one hundred twenty thousand, six hundred fifty-seven".