1212128203 has 16 divisors (see below), whose sum is σ = 1507808736. Its totient is φ = 957335040.

The previous prime is 1212128143. The next prime is 1212128209. The reversal of 1212128203 is 3028212121.

It is a cyclic number.

It is not a de Polignac number, because 1212128203 - 2¹³ = 1212120011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212128209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246876 + ... + 251737.

It is an arithmetic number, because the mean of its divisors is an integer number (94238046).

Almost surely, 2^1212128203 is an apocalyptic number.

1212128203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1212128203 is a deficient number, since it is larger than the sum of its proper divisors (295680533).

1212128203 is a wasteful number, since it uses less digits than its factorization.

1212128203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498654.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1212128203 is about 34815.6315898477. The cubic root of 1212128203 is about 1066.2266140653.

The spelling of 1212128203 in words is "one billion, two hundred twelve million, one hundred twenty-eight thousand, two hundred three".