2103821381 has 2 divisors, whose sum is σ = 2103821382. Its totient is φ = 2103821380.

The previous prime is 2103821353. The next prime is 2103821399. The reversal of 2103821381 is 1831283012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1138725025 + 965096356 = 33745^2 + 31066^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103821381 - 2¹⁰ = 2103820357 is a prime.

It is a super-2 number, since 2×2103821381² = 8852128806305494322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102821381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051910690 + 1051910691.

It is an arithmetic number, because the mean of its divisors is an integer number (1051910691).

Almost surely, 2^2103821381 is an apocalyptic number.

It is an amenable number.

2103821381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2103821381 is an equidigital number, since it uses as much as digits as its factorization.

2103821381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 2103821381 is about 45867.4326837681. The cubic root of 2103821381 is about 1281.3554531773.

The spelling of 2103821381 in words is "two billion, one hundred three million, eight hundred twenty-one thousand, three hundred eighty-one".