1057052021 has 4 divisors (see below), whose sum is σ = 1068929100. Its totient is φ = 1045174944.

The previous prime is 1057052011. The next prime is 1057052039. The reversal of 1057052021 is 1202507501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 443944900 + 613107121 = 21070^2 + 24761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1057052021 is a prime.

It is a super-2 number, since 2×1057052021² = 2234717950200368882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057052011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5938406 + ... + 5938583.

It is an arithmetic number, because the mean of its divisors is an integer number (267232275).

Almost surely, 2^1057052021 is an apocalyptic number.

It is an amenable number.

1057052021 is a deficient number, since it is larger than the sum of its proper divisors (11877079).

1057052021 is an equidigital number, since it uses as much as digits as its factorization.

1057052021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11877078.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 1057052021 is about 32512.3364432641. The cubic root of 1057052021 is about 1018.6667255705. Note that the first 3 decimals are identical.

Adding to 1057052021 its reverse (1202507501), we get a palindrome (2259559522).

The spelling of 1057052021 in words is "one billion, fifty-seven million, fifty-two thousand, twenty-one".