213201221021 has 8 divisors (see below), whose sum is σ = 218408870904. Its totient is φ = 207993934080.

The previous prime is 213201220943. The next prime is 213201221041. The reversal of 213201221021 is 120122102312.

It can be written as a sum of positive squares in 4 ways, for example, as 7008033796 + 206193187225 = 83714^2 + 454085^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213201221021 - 2¹⁰ = 213201219997 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 (213201221041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1389881 + ... + 1535633.

It is an arithmetic number, because the mean of its divisors is an integer number (27301108863).

Almost surely, 2^213201221021 is an apocalyptic number.

It is an amenable number.

213201221021 is a deficient number, since it is larger than the sum of its proper divisors (5207649883).

213201221021 is a wasteful number, since it uses less digits than its factorization.

213201221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181471.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 213201221021 its reverse (120122102312), we get a palindrome (333323323333).

The spelling of 213201221021 in words is "two hundred thirteen billion, two hundred one million, two hundred twenty-one thousand, twenty-one".