223021220021 has 4 divisors (see below), whose sum is σ = 223022197152. Its totient is φ = 223020242892.

The previous prime is 223021220003. The next prime is 223021220039. The reversal of 223021220021 is 120022120322.

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, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (223021220003) and next prime (223021220039).

It is a cyclic number.

It is not a de Polignac number, because 223021220021 - 2¹⁸ = 223020957877 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 (223021220041) 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, 56486 + ... + 670248.

It is an arithmetic number, because the mean of its divisors is an integer number (55755549288).

Almost surely, 2^223021220021 is an apocalyptic number.

It is an amenable number.

223021220021 is a deficient number, since it is larger than the sum of its proper divisors (977131).

223021220021 is an equidigital number, since it uses as much as digits as its factorization.

223021220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977130.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 223021220021 its reverse (120022120322), we get a palindrome (343043340343).

The spelling of 223021220021 in words is "two hundred twenty-three billion, twenty-one million, two hundred twenty thousand, twenty-one".