213122302021 has 4 divisors (see below), whose sum is σ = 213243879532. Its totient is φ = 213000724512.

The previous prime is 213122301971. The next prime is 213122302031. The reversal of 213122302021 is 120203221312.

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 28759411396 + 184362890625 = 169586^2 + 429375^2 .

It is a cyclic number.

It is not a de Polignac number, because 213122302021 - 2¹³ = 213122293829 is a prime.

It is a super-2 number, since 2×213122302021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213122302021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213122302031) 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, 60786126 + ... + 60789631.

It is an arithmetic number, because the mean of its divisors is an integer number (53310969883).

Almost surely, 2^213122302021 is an apocalyptic number.

It is an amenable number.

213122302021 is a deficient number, since it is larger than the sum of its proper divisors (121577511).

213122302021 is a wasteful number, since it uses less digits than its factorization.

213122302021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121577510.

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

Adding to 213122302021 its reverse (120203221312), we get a palindrome (333325523333).

The spelling of 213122302021 in words is "two hundred thirteen billion, one hundred twenty-two million, three hundred two thousand, twenty-one".