2161020203 has 2 divisors, whose sum is σ = 2161020204. Its totient is φ = 2161020202.

The previous prime is 2161020181. The next prime is 2161020217. The reversal of 2161020203 is 3020201612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2161020203 - 2¹⁶ = 2160954667 is a prime.

It is a super-2 number, since 2×2161020203² = 9340016635548322418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2161020293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080510101 + 1080510102.

It is an arithmetic number, because the mean of its divisors is an integer number (1080510102).

Almost surely, 2^2161020203 is an apocalyptic number.

2161020203 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161020203 is an equidigital number, since it uses as much as digits as its factorization.

2161020203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2161020203 is about 46486.7744955487. The cubic root of 2161020203 is about 1292.8642968692.

Adding to 2161020203 its reverse (3020201612), we get a palindrome (5181221815).

The spelling of 2161020203 in words is "two billion, one hundred sixty-one million, twenty thousand, two hundred three".