2130400081 has 2 divisors, whose sum is σ = 2130400082. Its totient is φ = 2130400080.

The previous prime is 2130400009. The next prime is 2130400087. The reversal of 2130400081 is 1800040312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1830556225 + 299843856 = 42785^2 + 17316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2130400081 is a prime.

It is a super-2 number, since 2×2130400081² = 9077209010249613122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2130400087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065200040 + 1065200041.

It is an arithmetic number, because the mean of its divisors is an integer number (1065200041).

Almost surely, 2^2130400081 is an apocalyptic number.

It is an amenable number.

2130400081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130400081 is an equidigital number, since it uses as much as digits as its factorization.

2130400081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2130400081 is about 46156.2572247794. The cubic root of 2130400081 is about 1286.7289038580.

Adding to 2130400081 its reverse (1800040312), we get a palindrome (3930440393).

The spelling of 2130400081 in words is "two billion, one hundred thirty million, four hundred thousand, eighty-one".