212331011021 has 4 divisors (see below), whose sum is σ = 212437338012. Its totient is φ = 212224684032.

The previous prime is 212331011003. The next prime is 212331011059. The reversal of 212331011021 is 120110133212.

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 10253790121 + 202077220900 = 101261^2 + 449530^2 .

It is a cyclic number.

It is not a de Polignac number, because 212331011021 - 2²² = 212326816717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212331011521) 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, 53160500 + ... + 53164493.

It is an arithmetic number, because the mean of its divisors is an integer number (53109334503).

Almost surely, 2^212331011021 is an apocalyptic number.

It is an amenable number.

212331011021 is a deficient number, since it is larger than the sum of its proper divisors (106326991).

212331011021 is a wasteful number, since it uses less digits than its factorization.

212331011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106326990.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 212331011021 its reverse (120110133212), we get a palindrome (332441144233).

The spelling of 212331011021 in words is "two hundred twelve billion, three hundred thirty-one million, eleven thousand, twenty-one".