2429138821 has 2 divisors, whose sum is σ = 2429138822. Its totient is φ = 2429138820.

The previous prime is 2429138819. The next prime is 2429138863. The reversal of 2429138821 is 1288319242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2333373025 + 95765796 = 48305^2 + 9786^2 .

It is a cyclic number.

It is not a de Polignac number, because 2429138821 - 2¹ = 2429138819 is a prime.

Together with 2429138819, 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 (2409138821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1214569410 + 1214569411.

It is an arithmetic number, because the mean of its divisors is an integer number (1214569411).

Almost surely, 2^2429138821 is an apocalyptic number.

It is an amenable number.

2429138821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2429138821 is an equidigital number, since it uses as much as digits as its factorization.

2429138821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 2429138821 is about 49286.2944539352. The cubic root of 2429138821 is about 1344.2625866152.

The spelling of 2429138821 in words is "two billion, four hundred twenty-nine million, one hundred thirty-eight thousand, eight hundred twenty-one".