213044222021 has 4 divisors (see below), whose sum is σ = 214351241952. Its totient is φ = 211737202092.

The previous prime is 213044222009. The next prime is 213044222051. The reversal of 213044222021 is 120222440312.

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 213044222021 - 2¹⁴ = 213044205637 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 (213044222051) 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, 653509721 + ... + 653510046.

It is an arithmetic number, because the mean of its divisors is an integer number (53587810488).

Almost surely, 2^213044222021 is an apocalyptic number.

It is an amenable number.

213044222021 is a deficient number, since it is larger than the sum of its proper divisors (1307019931).

213044222021 is a wasteful number, since it uses less digits than its factorization.

213044222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307019930.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 213044222021 its reverse (120222440312), we get a palindrome (333266662333).

The spelling of 213044222021 in words is "two hundred thirteen billion, forty-four million, two hundred twenty-two thousand, twenty-one".