1103057821 has 2 divisors, whose sum is σ = 1103057822. Its totient is φ = 1103057820.

The previous prime is 1103057819. The next prime is 1103057843. The reversal of 1103057821 is 1287503011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 888874596 + 214183225 = 29814^2 + 14635^2 .

It is an emirp because it is prime and its reverse (1287503011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1103057821 - 2¹ = 1103057819 is a prime.

Together with 1103057819, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1103057821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1103057881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551528910 + 551528911.

It is an arithmetic number, because the mean of its divisors is an integer number (551528911).

Almost surely, 2^1103057821 is an apocalyptic number.

It is an amenable number.

1103057821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103057821 is an equidigital number, since it uses as much as digits as its factorization.

1103057821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 1103057821 is about 33212.3142975614. The cubic root of 1103057821 is about 1033.2357540763.

The spelling of 1103057821 in words is "one billion, one hundred three million, fifty-seven thousand, eight hundred twenty-one".