1043221381 has 2 divisors, whose sum is σ = 1043221382. Its totient is φ = 1043221380.

The previous prime is 1043221369. The next prime is 1043221411. The reversal of 1043221381 is 1831223401.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 789329025 + 253892356 = 28095^2 + 15934^2 .

It is a cyclic number.

It is not a de Polignac number, because 1043221381 - 2⁵ = 1043221349 is a prime.

It is a super-2 number, since 2×1043221381² = 2176621699551094322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1043221681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521610690 + 521610691.

It is an arithmetic number, because the mean of its divisors is an integer number (521610691).

Almost surely, 2^1043221381 is an apocalyptic number.

It is an amenable number.

1043221381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1043221381 is an equidigital number, since it uses as much as digits as its factorization.

1043221381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1043221381 is about 32298.9377689112. The cubic root of 1043221381 is about 1014.2044065174.

Adding to 1043221381 its reverse (1831223401), we get a palindrome (2874444782).

It can be divided in two parts, 10432 and 21381, that added together give a palindrome (31813).

The spelling of 1043221381 in words is "one billion, forty-three million, two hundred twenty-one thousand, three hundred eighty-one".