1051025221 has 24 divisors (see below), whose sum is σ = 1179641880. Its totient is φ = 932069376.

The previous prime is 1051025207. The next prime is 1051025249. The reversal of 1051025221 is 1225201501.

It can be written as a sum of positive squares in 4 ways, for example, as 443944900 + 607080321 = 21070^2 + 24639^2 .

It is not a de Polignac number, because 1051025221 - 2⁷ = 1051025093 is a prime.

It is a super-2 number, since 2×1051025221² = 2209308030356197682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051025321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 910981 + ... + 912133.

It is an arithmetic number, because the mean of its divisors is an integer number (49151745).

Almost surely, 2^1051025221 is an apocalyptic number.

It is an amenable number.

1051025221 is a deficient number, since it is larger than the sum of its proper divisors (128616659).

1051025221 is a wasteful number, since it uses less digits than its factorization.

1051025221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1051025221 is about 32419.5191358539. The cubic root of 1051025221 is about 1016.7270526645.

Adding to 1051025221 its reverse (1225201501), we get a palindrome (2276226722).

The spelling of 1051025221 in words is "one billion, fifty-one million, twenty-five thousand, two hundred twenty-one".