16506022121 has 2 divisors, whose sum is σ = 16506022122. Its totient is φ = 16506022120.

The previous prime is 16506022037. The next prime is 16506022129. The reversal of 16506022121 is 12122060561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12850489600 + 3655532521 = 113360^2 + 60461^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506022121 - 2¹⁰ = 16506021097 is a prime.

It is not a weakly prime, because it can be changed into another prime (16506022129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253011060 + 8253011061.

It is an arithmetic number, because the mean of its divisors is an integer number (8253011061).

Almost surely, 2^16506022121 is an apocalyptic number.

It is an amenable number.

16506022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506022121 is an equidigital number, since it uses as much as digits as its factorization.

16506022121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 16506022121 its reverse (12122060561), we get a palindrome (28628082682).

The spelling of 16506022121 in words is "sixteen billion, five hundred six million, twenty-two thousand, one hundred twenty-one".