1012421257 has 4 divisors (see below), whose sum is σ = 1014194896. Its totient is φ = 1010647620.

The previous prime is 1012421243. The next prime is 1012421279. The reversal of 1012421257 is 7521242101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7521242101 = 43 ⋅174912607.

It is a cyclic number.

It is not a de Polignac number, because 1012421257 - 2¹⁹ = 1011896969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012421227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885963 + ... + 887104.

It is an arithmetic number, because the mean of its divisors is an integer number (253548724).

Almost surely, 2^1012421257 is an apocalyptic number.

It is an amenable number.

1012421257 is a deficient number, since it is larger than the sum of its proper divisors (1773639).

1012421257 is an equidigital number, since it uses as much as digits as its factorization.

1012421257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773638.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1012421257 is about 31818.5678024640. The cubic root of 1012421257 is about 1004.1233932589.

Adding to 1012421257 its reverse (7521242101), we get a palindrome (8533663358).

The spelling of 1012421257 in words is "one billion, twelve million, four hundred twenty-one thousand, two hundred fifty-seven".