1021225525 has 6 divisors (see below), whose sum is σ = 1266319682. Its totient is φ = 816980400.

The previous prime is 1021225489. The next prime is 1021225559. The reversal of 1021225525 is 5255221201.

It can be written as a sum of positive squares in 3 ways, for example, as 42224004 + 979001521 = 6498^2 + 31289^2 .

It is not a de Polignac number, because 1021225525 - 2¹⁹ = 1020701237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 40849021 = 1021225525 / (1 + 0 + 2 + 1 + 2 + 2 + 5 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021225525.

It is a congruent 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, 20424486 + ... + 20424535.

Almost surely, 2^1021225525 is an apocalyptic number.

It is an amenable number.

1021225525 is a deficient number, since it is larger than the sum of its proper divisors (245094157).

1021225525 is an equidigital number, since it uses as much as digits as its factorization.

1021225525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40849031 (or 40849026 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1021225525 is about 31956.6194238377. The cubic root of 1021225525 is about 1007.0256989570.

Adding to 1021225525 its reverse (5255221201), we get a palindrome (6276446726).

The spelling of 1021225525 in words is "one billion, twenty-one million, two hundred twenty-five thousand, five hundred twenty-five".