213220321021 has 8 divisors (see below), whose sum is σ = 225034647200. Its totient is φ = 201465215280.

The previous prime is 213220321009. The next prime is 213220321037. The reversal of 213220321021 is 120123022312.

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 213220321021 - 2¹³ = 213220312829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 213220321021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213220321051) 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, 14797710 + ... + 14812111.

It is an arithmetic number, because the mean of its divisors is an integer number (28129330900).

Almost surely, 2^213220321021 is an apocalyptic number.

It is an amenable number.

213220321021 is a deficient number, since it is larger than the sum of its proper divisors (11814326179).

213220321021 is a wasteful number, since it uses less digits than its factorization.

213220321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29610219.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 213220321021 its reverse (120123022312), we get a palindrome (333343343333).

The spelling of 213220321021 in words is "two hundred thirteen billion, two hundred twenty million, three hundred twenty-one thousand, twenty-one".