213220232023021 has 4 divisors (see below), whose sum is σ = 218178842070112. Its totient is φ = 208261621975932.

The previous prime is 213220232022989. The next prime is 213220232023037. The reversal of 213220232023021 is 120320232022312.

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 not a de Polignac number, because 213220232023021 - 2⁵ = 213220232022989 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 (213220232023091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2479305023481 + ... + 2479305023566.

It is an arithmetic number, because the mean of its divisors is an integer number (54544710517528).

Almost surely, 2^{213220232023021} is an apocalyptic number.

It is an amenable number.

213220232023021 is a deficient number, since it is larger than the sum of its proper divisors (4958610047091).

213220232023021 is an equidigital number, since it uses as much as digits as its factorization.

213220232023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4958610047090.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 213220232023021 its reverse (120320232022312), we get a palindrome (333540464045333).

The spelling of 213220232023021 in words is "two hundred thirteen trillion, two hundred twenty billion, two hundred thirty-two million, twenty-three thousand, twenty-one".