1212542120 has 32 divisors (see below), whose sum is σ = 2730346920. Its totient is φ = 484638720.

The previous prime is 1212542069. The next prime is 1212542131. The reversal of 1212542120 is 212452121.

It can be written as a sum of positive squares in 4 ways, for example, as 339812356 + 872729764 = 18434^2 + 29542^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1212542092 and 1212542101.

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 7 ways as a sum of consecutive naturals, for example, 43304 + ... + 65576.

Almost surely, 2^1212542120 is an apocalyptic number.

1212542120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212542120 is an abundant number, since it is smaller than the sum of its proper divisors (1517804800).

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

1212542120 is a wasteful number, since it uses less digits than its factorization.

1212542120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23645 (or 23641 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1212542120 is about 34821.5754956607. The cubic root of 1212542120 is about 1066.3479651168.

Adding to 1212542120 its reverse (212452121), we get a palindrome (1424994241).

It can be divided in two parts, 12125 and 42120, that added together give a palindrome (54245).

The spelling of 1212542120 in words is "one billion, two hundred twelve million, five hundred forty-two thousand, one hundred twenty".