2145921139 has 2 divisors, whose sum is σ = 2145921140. Its totient is φ = 2145921138.

The previous prime is 2145921103. The next prime is 2145921179. The reversal of 2145921139 is 9311295412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145921139 - 2²¹ = 2143823987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2145921098 and 2145921107.

It is not a weakly prime, because it can be changed into another prime (2145921179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072960569 + 1072960570.

It is an arithmetic number, because the mean of its divisors is an integer number (1072960570).

Almost surely, 2^2145921139 is an apocalyptic number.

2145921139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145921139 is an equidigital number, since it uses as much as digits as its factorization.

2145921139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 2145921139 is about 46324.0881075926. The cubic root of 2145921139 is about 1289.8461725915.

The spelling of 2145921139 in words is "two billion, one hundred forty-five million, nine hundred twenty-one thousand, one hundred thirty-nine".