16216411021 has 2 divisors, whose sum is σ = 16216411022. Its totient is φ = 16216411020.

The previous prime is 16216411019. The next prime is 16216411039. The reversal of 16216411021 is 12011461261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15522668100 + 693742921 = 124590^2 + 26339^2 .

It is a cyclic number.

It is not a de Polignac number, because 16216411021 - 2¹ = 16216411019 is a prime.

Together with 16216411019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16216411091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8108205510 + 8108205511.

It is an arithmetic number, because the mean of its divisors is an integer number (8108205511).

Almost surely, 2^16216411021 is an apocalyptic number.

It is an amenable number.

16216411021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16216411021 is an equidigital number, since it uses as much as digits as its factorization.

16216411021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 16216411021 its reverse (12011461261), we get a palindrome (28227872282).

The spelling of 16216411021 in words is "sixteen billion, two hundred sixteen million, four hundred eleven thousand, twenty-one".