1052420021 has 4 divisors (see below), whose sum is σ = 1078088844. Its totient is φ = 1026751200.

The previous prime is 1052419967. The next prime is 1052420041. The reversal of 1052420021 is 1200242501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200242501 = 10729 ⋅111869.

It can be written as a sum of positive squares in 2 ways, for example, as 270602500 + 781817521 = 16450^2 + 27961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1052420021 - 2¹⁴ = 1052403637 is a prime.

It is a super-2 number, since 2×1052420021² = 2215175801203280882, 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 (1052420041) 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, 12834350 + ... + 12834431.

It is an arithmetic number, because the mean of its divisors is an integer number (269522211).

Almost surely, 2^1052420021 is an apocalyptic number.

It is an amenable number.

1052420021 is a deficient number, since it is larger than the sum of its proper divisors (25668823).

1052420021 is an equidigital number, since it uses as much as digits as its factorization.

1052420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25668822.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1052420021 is about 32441.0237353879. The cubic root of 1052420021 is about 1017.1766149903.

Adding to 1052420021 its reverse (1200242501), we get a palindrome (2252662522).

The spelling of 1052420021 in words is "one billion, fifty-two million, four hundred twenty thousand, twenty-one".