1005213421 has 4 divisors (see below), whose sum is σ = 1005278112. Its totient is φ = 1005148732.

The previous prime is 1005213403. The next prime is 1005213427. The reversal of 1005213421 is 1243125001.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1005213421 - 2⁹ = 1005212909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005213427) 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, 6570 + ... + 45316.

It is an arithmetic number, because the mean of its divisors is an integer number (251319528).

Almost surely, 2^1005213421 is an apocalyptic number.

It is an amenable number.

1005213421 is a deficient number, since it is larger than the sum of its proper divisors (64691).

1005213421 is an equidigital number, since it uses as much as digits as its factorization.

1005213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64690.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1005213421 is about 31705.1008672106. The cubic root of 1005213421 is about 1001.7347957434.

Adding to 1005213421 its reverse (1243125001), we get a palindrome (2248338422).

The spelling of 1005213421 in words is "one billion, five million, two hundred thirteen thousand, four hundred twenty-one".