1021020453 has 12 divisors (see below), whose sum is σ = 1475217900. Its totient is φ = 680490816.

The previous prime is 1021020443. The next prime is 1021020491. The reversal of 1021020453 is 3540201201.

1021020453 is a `hidden beast` number, since 1 + 0 + 210 + 2 + 0 + 453 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 759939489 + 261080964 = 27567^2 + 16158^2 .

It is not a de Polignac number, because 1021020453 - 2⁹ = 1021019941 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021020443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23473 + ... + 50921.

It is an arithmetic number, because the mean of its divisors is an integer number (122934825).

Almost surely, 2^1021020453 is an apocalyptic number.

It is an amenable number.

1021020453 is a deficient number, since it is larger than the sum of its proper divisors (454197447).

1021020453 is a wasteful number, since it uses less digits than its factorization.

1021020453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31588 (or 31585 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1021020453 is about 31953.4106630263. The cubic root of 1021020453 is about 1006.9582875988.

Adding to 1021020453 its reverse (3540201201), we get a palindrome (4561221654).

The spelling of 1021020453 in words is "one billion, twenty-one million, twenty thousand, four hundred fifty-three".