1020252521 has 8 divisors (see below), whose sum is σ = 1026205440. Its totient is φ = 1014314112.

The previous prime is 1020252437. The next prime is 1020252539. The reversal of 1020252521 is 1252520201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020252521 - 2²⁶ = 953143657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020252493 and 1020252502.

It is not an unprimeable number, because it can be changed into a prime (1020252551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157676 + ... + 164018.

It is an arithmetic number, because the mean of its divisors is an integer number (128275680).

Almost surely, 2^1020252521 is an apocalyptic number.

It is an amenable number.

1020252521 is a deficient number, since it is larger than the sum of its proper divisors (5952919).

1020252521 is an equidigital number, since it uses as much as digits as its factorization.

1020252521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7255.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1020252521 is about 31941.3919702946. The cubic root of 1020252521 is about 1006.7057724357.

Adding to 1020252521 its reverse (1252520201), we get a palindrome (2272772722).

The spelling of 1020252521 in words is "one billion, twenty million, two hundred fifty-two thousand, five hundred twenty-one".