1005225421 has 4 divisors (see below), whose sum is σ = 1022263200. Its totient is φ = 988187644.

The previous prime is 1005225407. The next prime is 1005225443. The reversal of 1005225421 is 1245225001.

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: 1245225001 = 7741 ⋅160861.

It is a cyclic number.

It is not a de Polignac number, because 1005225421 - 2¹³ = 1005217229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1005225392 and 1005225401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005225451) 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, 8518801 + ... + 8518918.

It is an arithmetic number, because the mean of its divisors is an integer number (255565800).

Almost surely, 2^1005225421 is an apocalyptic number.

It is an amenable number.

1005225421 is a deficient number, since it is larger than the sum of its proper divisors (17037779).

1005225421 is an equidigital number, since it uses as much as digits as its factorization.

1005225421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17037778.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1005225421 is about 31705.2901106424. The cubic root of 1005225421 is about 1001.7387818852.

The spelling of 1005225421 in words is "one billion, five million, two hundred twenty-five thousand, four hundred twenty-one".