2105421047 has 2 divisors, whose sum is σ = 2105421048. Its totient is φ = 2105421046.

The previous prime is 2105421037. The next prime is 2105421139. The reversal of 2105421047 is 7401245012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2105421047 - 2¹⁴ = 2105404663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105421037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052710523 + 1052710524.

It is an arithmetic number, because the mean of its divisors is an integer number (1052710524).

Almost surely, 2^2105421047 is an apocalyptic number.

2105421047 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105421047 is an equidigital number, since it uses as much as digits as its factorization.

2105421047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 2105421047 is about 45884.8672984896. The cubic root of 2105421047 is about 1281.6801355981.

Adding to 2105421047 its reverse (7401245012), we get a palindrome (9506666059).

The spelling of 2105421047 in words is "two billion, one hundred five million, four hundred twenty-one thousand, forty-seven".