1021123225 has 24 divisors (see below), whose sum is σ = 1321805528. Its totient is φ = 781747200.

The previous prime is 1021123211. The next prime is 1021123333. The reversal of 1021123225 is 5223211201.

It can be written as a sum of positive squares in 12 ways, for example, as 542563849 + 478559376 = 23293^2 + 21876^2 .

It is not a de Polignac number, because 1021123225 - 2¹¹ = 1021121177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47377 + ... + 65473.

Almost surely, 2^1021123225 is an apocalyptic number.

It is an amenable number.

1021123225 is a deficient number, since it is larger than the sum of its proper divisors (300682303).

1021123225 is a wasteful number, since it uses less digits than its factorization.

1021123225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18205 (or 18200 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1021123225 is about 31955.0187763988. The cubic root of 1021123225 is about 1006.9920719841.

Adding to 1021123225 its reverse (5223211201), we get a palindrome (6244334426).

The spelling of 1021123225 in words is "one billion, twenty-one million, one hundred twenty-three thousand, two hundred twenty-five".