2124212491 has 2 divisors, whose sum is σ = 2124212492. Its totient is φ = 2124212490.

The previous prime is 2124212413. The next prime is 2124212527. The reversal of 2124212491 is 1942124212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2124212491 is a prime.

It is not a weakly prime, because it can be changed into another prime (2124212891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062106245 + 1062106246.

It is an arithmetic number, because the mean of its divisors is an integer number (1062106246).

Almost surely, 2^2124212491 is an apocalyptic number.

2124212491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2124212491 is an equidigital number, since it uses as much as digits as its factorization.

2124212491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 2124212491 is about 46089.1797605468. The cubic root of 2124212491 is about 1285.4819594402.

It can be divided in two parts, 21242 and 12491, that added together give a palindrome (33733).

The spelling of 2124212491 in words is "two billion, one hundred twenty-four million, two hundred twelve thousand, four hundred ninety-one".