220001300021 has 2 divisors, whose sum is σ = 220001300022. Its totient is φ = 220001300020.

The previous prime is 220001299979. The next prime is 220001300023. The reversal of 220001300021 is 120003100022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200981856100 + 19019443921 = 448310^2 + 137911^2 .

It is a cyclic number.

It is not a de Polignac number, because 220001300021 - 2¹⁸ = 220001037877 is a prime.

Together with 220001300023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 220001299975 and 220001300011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220001300023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110000650010 + 110000650011.

It is an arithmetic number, because the mean of its divisors is an integer number (110000650011).

Almost surely, 2^220001300021 is an apocalyptic number.

It is an amenable number.

220001300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220001300021 is an equidigital number, since it uses as much as digits as its factorization.

220001300021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 220001300021 its reverse (120003100022), we get a palindrome (340004400043).

The spelling of 220001300021 in words is "two hundred twenty billion, one million, three hundred thousand, twenty-one".