2120012581 has 2 divisors, whose sum is σ = 2120012582. Its totient is φ = 2120012580.

The previous prime is 2120012579. The next prime is 2120012621. The reversal of 2120012581 is 1852100212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276632900 + 843379681 = 35730^2 + 29041^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120012581 - 2¹ = 2120012579 is a prime.

It is a super-2 number, since 2×2120012581² = 8988906687196563122, which contains 22 as substring.

Together with 2120012579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120012551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060006290 + 1060006291.

It is an arithmetic number, because the mean of its divisors is an integer number (1060006291).

Almost surely, 2^2120012581 is an apocalyptic number.

It is an amenable number.

2120012581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120012581 is an equidigital number, since it uses as much as digits as its factorization.

2120012581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 2120012581 is about 46043.5943536123. The cubic root of 2120012581 is about 1284.6341988947.

Adding to 2120012581 its reverse (1852100212), we get a palindrome (3972112793).

The spelling of 2120012581 in words is "two billion, one hundred twenty million, twelve thousand, five hundred eighty-one".