213203010012121 has 4 divisors (see below), whose sum is σ = 213235545194932. Its totient is φ = 213170474829312.

The previous prime is 213203010012107. The next prime is 213203010012163. The reversal of 213203010012121 is 121210010302312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154956562904025 + 58246447108096 = 12448155^2 + 7631936^2 .

It is a cyclic number.

It is not a de Polignac number, because 213203010012121 - 2³⁷ = 213065571058649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213203010012221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16267581576 + ... + 16267594681.

It is an arithmetic number, because the mean of its divisors is an integer number (53308886298733).

Almost surely, 2^{213203010012121} is an apocalyptic number.

It is an amenable number.

213203010012121 is a deficient number, since it is larger than the sum of its proper divisors (32535182811).

213203010012121 is an equidigital number, since it uses as much as digits as its factorization.

213203010012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32535182810.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 213203010012121 its reverse (121210010302312), we get a palindrome (334413020314433).

The spelling of 213203010012121 in words is "two hundred thirteen trillion, two hundred three billion, ten million, twelve thousand, one hundred twenty-one".