1021122025 has 81 divisors (see below), whose sum is σ = 1638731703. Its totient is φ = 628874400.

The previous prime is 1021122013. The next prime is 1021122031. The reversal of 1021122025 is 5202211201.

It is a happy number.

The square root of 1021122025 is 31955.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 367603929 + 653518096 = 19173^2 + 25564^2 .

It is not a de Polignac number, because 1021122025 - 2⁵ = 1021121993 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 12302634 + ... + 12302716.

Almost surely, 2^1021122025 is an apocalyptic number.

1021122025 is the 31955-th square number.

1021122025 is the 15978-th centered octagonal number.

It is an amenable number.

1021122025 is a deficient number, since it is larger than the sum of its proper divisors (617609678).

1021122025 is an equidigital number, since it uses as much as digits as its factorization.

1021122025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The cubic root of 1021122025 is about 1006.9916775194.

Multiplying 1021122025 by its sum of digits (16), we get a square (16337952400 = 127820²).

Adding to 1021122025 its reverse (5202211201), we get a palindrome (6223333226).

The spelling of 1021122025 in words is "one billion, twenty-one million, one hundred twenty-two thousand, twenty-five".