2123521139 has 2 divisors, whose sum is σ = 2123521140. Its totient is φ = 2123521138.

The previous prime is 2123521129. The next prime is 2123521217. The reversal of 2123521139 is 9311253212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123521139 - 2¹² = 2123517043 is a prime.

It is not a weakly prime, because it can be changed into another prime (2123521109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061760569 + 1061760570.

It is an arithmetic number, because the mean of its divisors is an integer number (1061760570).

Almost surely, 2^2123521139 is an apocalyptic number.

2123521139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123521139 is an equidigital number, since it uses as much as digits as its factorization.

2123521139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 2123521139 is about 46081.6789950193. The cubic root of 2123521139 is about 1285.3424854845.

The spelling of 2123521139 in words is "two billion, one hundred twenty-three million, five hundred twenty-one thousand, one hundred thirty-nine".