16210211020021 has 2 divisors, whose sum is σ = 16210211020022. Its totient is φ = 16210211020020.

The previous prime is 16210211020009. The next prime is 16210211020051. The reversal of 16210211020021 is 12002011201261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11991253939921 + 4218957080100 = 3462839^2 + 2054010^2 .

It is an emirp because it is prime and its reverse (12002011201261) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16210211020021 is a prime.

It is a super-2 number, since 2×16210211020021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16210211020051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8105105510010 + 8105105510011.

It is an arithmetic number, because the mean of its divisors is an integer number (8105105510011).

Almost surely, 2^{16210211020021} is an apocalyptic number.

It is an amenable number.

16210211020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16210211020021 is an equidigital number, since it uses as much as digits as its factorization.

16210211020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 16210211020021 its reverse (12002011201261), we get a palindrome (28212222221282).

The spelling of 16210211020021 in words is "sixteen trillion, two hundred ten billion, two hundred eleven million, twenty thousand, twenty-one".