213322021 has 4 divisors (see below), whose sum is σ = 232714944. Its totient is φ = 193929100.

The previous prime is 213322009. The next prime is 213322061. The reversal of 213322021 is 120223312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213322021 - 2⁵ = 213321989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213321986 and 213322004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213322061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9696445 + ... + 9696466.

It is an arithmetic number, because the mean of its divisors is an integer number (58178736).

Almost surely, 2^213322021 is an apocalyptic number.

It is an amenable number.

213322021 is a deficient number, since it is larger than the sum of its proper divisors (19392923).

213322021 is a wasteful number, since it uses less digits than its factorization.

213322021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19392922.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 213322021 is about 14605.5476104116. The cubic root of 213322021 is about 597.5100711992.

Adding to 213322021 its reverse (120223312), we get a palindrome (333545333).

The spelling of 213322021 in words is "two hundred thirteen million, three hundred twenty-two thousand, twenty-one".