1021240553 has 8 divisors (see below), whose sum is σ = 1030640520. Its totient is φ = 1011882240.

The previous prime is 1021240537. The next prime is 1021240579. The reversal of 1021240553 is 3550421201.

It can be written as a sum of positive squares in 4 ways, for example, as 310249 + 1020930304 = 557^2 + 31952^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021240553 - 2⁴ = 1021240537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021240523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39953 + ... + 60321.

It is an arithmetic number, because the mean of its divisors is an integer number (128830065).

Almost surely, 2^1021240553 is an apocalyptic number.

It is an amenable number.

1021240553 is a deficient number, since it is larger than the sum of its proper divisors (9399967).

1021240553 is a wasteful number, since it uses less digits than its factorization.

1021240553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20827.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1021240553 is about 31956.8545542267. The cubic root of 1021240553 is about 1007.0306386128.

Adding to 1021240553 its reverse (3550421201), we get a palindrome (4571661754).

The spelling of 1021240553 in words is "one billion, twenty-one million, two hundred forty thousand, five hundred fifty-three".