1021531426 has 4 divisors (see below), whose sum is σ = 1532297142. Its totient is φ = 510765712.

The previous prime is 1021531421. The next prime is 1021531429. The reversal of 1021531426 is 6241351201.

It is a happy number.

1021531426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6241351201 = 6053 ⋅1031117.

It can be written as a sum of positive squares in only one way, i.e., 586850625 + 434680801 = 24225^2 + 20849^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1021531426.

It is not an unprimeable number, because it can be changed into a prime (1021531421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255382855 + ... + 255382858.

Almost surely, 2^1021531426 is an apocalyptic number.

1021531426 is a deficient number, since it is larger than the sum of its proper divisors (510765716).

1021531426 is an equidigital number, since it uses as much as digits as its factorization.

1021531426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510765715.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1021531426 is about 31961.4052569658. The cubic root of 1021531426 is about 1007.1262380993.

Adding to 1021531426 its reverse (6241351201), we get a palindrome (7262882627).

The spelling of 1021531426 in words is "one billion, twenty-one million, five hundred thirty-one thousand, four hundred twenty-six".