2101242181 has 2 divisors, whose sum is σ = 2101242182. Its totient is φ = 2101242180.

The previous prime is 2101242133. The next prime is 2101242271. The reversal of 2101242181 is 1812421012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1573391556 + 527850625 = 39666^2 + 22975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101242181 - 2¹⁷ = 2101111109 is a prime.

It is a super-2 number, since 2×2101242181² = 8830437406427273522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101242581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050621090 + 1050621091.

It is an arithmetic number, because the mean of its divisors is an integer number (1050621091).

Almost surely, 2^2101242181 is an apocalyptic number.

It is an amenable number.

2101242181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101242181 is an equidigital number, since it uses as much as digits as its factorization.

2101242181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 2101242181 is about 45839.3082517614. The cubic root of 2101242181 is about 1280.8316090459.

Adding to 2101242181 its reverse (1812421012), we get a palindrome (3913663193).

The spelling of 2101242181 in words is "two billion, one hundred one million, two hundred forty-two thousand, one hundred eighty-one".