213312021110021 has 4 divisors (see below), whose sum is σ = 213313996676844. Its totient is φ = 213310045543200.

The previous prime is 213312021110017. The next prime is 213312021110053. The reversal of 213312021110021 is 120011120213312.

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 134259472787521 + 79052548322500 = 11587039^2 + 8891150^2 .

It is a cyclic number.

It is not a de Polignac number, because 213312021110021 - 2² = 213312021110017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213312021109975 and 213312021110002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213312021110081) 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, 987621440 + ... + 987837401.

It is an arithmetic number, because the mean of its divisors is an integer number (53328499169211).

Almost surely, 2^{213312021110021} is an apocalyptic number.

It is an amenable number.

213312021110021 is a deficient number, since it is larger than the sum of its proper divisors (1975566823).

213312021110021 is a wasteful number, since it uses less digits than its factorization.

213312021110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975566822.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 213312021110021 its reverse (120011120213312), we get a palindrome (333323141323333).

The spelling of 213312021110021 in words is "two hundred thirteen trillion, three hundred twelve billion, twenty-one million, one hundred ten thousand, twenty-one".