201212121403 has 4 divisors (see below), whose sum is σ = 201277389528. Its totient is φ = 201146853280.

The previous prime is 201212121367. The next prime is 201212121443. The reversal of 201212121403 is 304121212102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304121212102 = 2 ⋅152060606051.

It is a cyclic number.

It is not a de Polignac number, because 201212121403 - 2⁹ = 201212120891 is a prime.

It is a super-2 number, since 2×201212121403² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201212121443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32629438 + ... + 32635603.

It is an arithmetic number, because the mean of its divisors is an integer number (50319347382).

Almost surely, 2^201212121403 is an apocalyptic number.

201212121403 is a deficient number, since it is larger than the sum of its proper divisors (65268125).

201212121403 is an equidigital number, since it uses as much as digits as its factorization.

201212121403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65268124.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 201212121403 its reverse (304121212102), we get a palindrome (505333333505).

The spelling of 201212121403 in words is "two hundred one billion, two hundred twelve million, one hundred twenty-one thousand, four hundred three".