1021440525 has 72 divisors (see below), whose sum is σ = 1971972000. Its totient is φ = 465171840.

The previous prime is 1021440521. The next prime is 1021440559. The reversal of 1021440525 is 5250441201.

It is not a de Polignac number, because 1021440525 - 2² = 1021440521 is a prime.

It is a super-2 number, since 2×1021440525² = 2086681492224551250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021440495 and 1021440504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021440521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1833547 + ... + 1834103.

It is an arithmetic number, because the mean of its divisors is an integer number (27388500).

Almost surely, 2^1021440525 is an apocalyptic number.

1021440525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021440525 is a deficient number, since it is larger than the sum of its proper divisors (950531475).

1021440525 is a wasteful number, since it uses less digits than its factorization.

1021440525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1021440525 is about 31959.9831820982. The cubic root of 1021440525 is about 1007.0963641619.

Adding to 1021440525 its reverse (5250441201), we get a palindrome (6271881726).

The spelling of 1021440525 in words is "one billion, twenty-one million, four hundred forty thousand, five hundred twenty-five".