2142105481 has 2 divisors, whose sum is σ = 2142105482. Its totient is φ = 2142105480.

The previous prime is 2142105443. The next prime is 2142105517. The reversal of 2142105481 is 1845012412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2106810000 + 35295481 = 45900^2 + 5941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2142105481 is a prime.

It is a super-2 number, since 2×2142105481² = 9177231783460482722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2142105401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071052740 + 1071052741.

It is an arithmetic number, because the mean of its divisors is an integer number (1071052741).

Almost surely, 2^2142105481 is an apocalyptic number.

It is an amenable number.

2142105481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142105481 is an equidigital number, since it uses as much as digits as its factorization.

2142105481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 2142105481 is about 46282.8854005452. The cubic root of 2142105481 is about 1289.0812280806.

Adding to 2142105481 its reverse (1845012412), we get a palindrome (3987117893).

The spelling of 2142105481 in words is "two billion, one hundred forty-two million, one hundred five thousand, four hundred eighty-one".