220231111021 has 4 divisors (see below), whose sum is σ = 220269464512. Its totient is φ = 220192757532.

The previous prime is 220231111019. The next prime is 220231111027. The reversal of 220231111021 is 120111132022.

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 220231111021 - 2¹ = 220231111019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220231110986 and 220231111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220231111027) 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, 19168131 + ... + 19179616.

It is an arithmetic number, because the mean of its divisors is an integer number (55067366128).

Almost surely, 2^220231111021 is an apocalyptic number.

It is an amenable number.

220231111021 is a deficient number, since it is larger than the sum of its proper divisors (38353491).

220231111021 is an equidigital number, since it uses as much as digits as its factorization.

220231111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38353490.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 220231111021 its reverse (120111132022), we get a palindrome (340342243043).

The spelling of 220231111021 in words is "two hundred twenty billion, two hundred thirty-one million, one hundred eleven thousand, twenty-one".