2003021261 has 2 divisors, whose sum is σ = 2003021262. Its totient is φ = 2003021260.

The previous prime is 2003021219. The next prime is 2003021269. The reversal of 2003021261 is 1621203002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2003010025 + 11236 = 44755^2 + 106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2003021261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2003021269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001510630 + 1001510631.

It is an arithmetic number, because the mean of its divisors is an integer number (1001510631).

Almost surely, 2^2003021261 is an apocalyptic number.

It is an amenable number.

2003021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003021261 is an equidigital number, since it uses as much as digits as its factorization.

2003021261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2003021261 is about 44755.1255276979. The cubic root of 2003021261 is about 1260.5551557573. Note that the first 3 decimals are identical.

Adding to 2003021261 its reverse (1621203002), we get a palindrome (3624224263).

The spelling of 2003021261 in words is "two billion, three million, twenty-one thousand, two hundred sixty-one".