1021671425 has 6 divisors (see below), whose sum is σ = 1266872598. Its totient is φ = 817337120.

The previous prime is 1021671419. The next prime is 1021671451. The reversal of 1021671425 is 5241761201.

It can be written as a sum of positive squares in 3 ways, for example, as 164762896 + 856908529 = 12836^2 + 29273^2 .

It is not a de Polignac number, because 1021671425 - 2⁶ = 1021671361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20433404 + ... + 20433453.

It is an arithmetic number, because the mean of its divisors is an integer number (211145433).

Almost surely, 2^1021671425 is an apocalyptic number.

It is an amenable number.

1021671425 is a deficient number, since it is larger than the sum of its proper divisors (245201173).

1021671425 is an equidigital number, since it uses as much as digits as its factorization.

1021671425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40866867 (or 40866862 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1021671425 is about 31963.5953077873. The cubic root of 1021671425 is about 1007.1722442629.

The spelling of 1021671425 in words is "one billion, twenty-one million, six hundred seventy-one thousand, four hundred twenty-five".