20221541 has 2 divisors, whose sum is σ = 20221542. Its totient is φ = 20221540.

The previous prime is 20221489. The next prime is 20221547. The reversal of 20221541 is 14512202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 729316 = 4415^2 + 854^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221541 - 2¹⁰ = 20220517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110770 + 10110771.

It is an arithmetic number, because the mean of its divisors is an integer number (10110771).

Almost surely, 2^20221541 is an apocalyptic number.

It is an amenable number.

20221541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221541 is an equidigital number, since it uses as much as digits as its factorization.

20221541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20221541 is about 4496.8367771134. The cubic root of 20221541 is about 272.4403415678.

Adding to 20221541 its reverse (14512202), we get a palindrome (34733743).

The spelling of 20221541 in words is "twenty million, two hundred twenty-one thousand, five hundred forty-one".