1021011025 has 6 divisors (see below), whose sum is σ = 1266053702. Its totient is φ = 816808800.

The previous prime is 1021011011. The next prime is 1021011031. The reversal of 1021011025 is 5201101201.

It can be written as a sum of positive squares in 3 ways, for example, as 101284096 + 919726929 = 10064^2 + 30327^2 .

It is not a de Polignac number, because 1021011025 - 2⁵ = 1021010993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021010996 and 1021011014.

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, 20420196 + ... + 20420245.

Almost surely, 2^1021011025 is an apocalyptic number.

It is an amenable number.

1021011025 is a deficient number, since it is larger than the sum of its proper divisors (245042677).

1021011025 is an equidigital number, since it uses as much as digits as its factorization.

1021011025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40840451 (or 40840446 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1021011025 is about 31953.2631353982. The cubic root of 1021011025 is about 1006.9551882054.

Adding to 1021011025 its reverse (5201101201), we get a palindrome (6222112226).

The spelling of 1021011025 in words is "one billion, twenty-one million, eleven thousand, twenty-five".