20228603437621 has 2 divisors, whose sum is σ = 20228603437622. Its totient is φ = 20228603437620.

The previous prime is 20228603437583. The next prime is 20228603437633. The reversal of 20228603437621 is 12673430682202.

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., 16884587755396 + 3344015682225 = 4109086^2 + 1828665^2 .

It is a cyclic number.

It is not a de Polignac number, because 20228603437621 - 2⁹ = 20228603437109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20228603437661) 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 as a sum of consecutive naturals, namely, 10114301718810 + 10114301718811.

It is an arithmetic number, because the mean of its divisors is an integer number (10114301718811).

Almost surely, 2^{20228603437621} is an apocalyptic number.

It is an amenable number.

20228603437621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20228603437621 is an equidigital number, since it uses as much as digits as its factorization.

20228603437621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 20228603437621 in words is "twenty trillion, two hundred twenty-eight billion, six hundred three million, four hundred thirty-seven thousand, six hundred twenty-one".