1021056253 has 4 divisors (see below), whose sum is σ = 1166921440. Its totient is φ = 875191068.

The previous prime is 1021056221. The next prime is 1021056263. The reversal of 1021056253 is 3526501201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021056253 - 2⁵ = 1021056221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021056263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72932583 + ... + 72932596.

It is an arithmetic number, because the mean of its divisors is an integer number (291730360).

Almost surely, 2^1021056253 is an apocalyptic number.

It is an amenable number.

1021056253 is a deficient number, since it is larger than the sum of its proper divisors (145865187).

1021056253 is an equidigital number, since it uses as much as digits as its factorization.

1021056253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145865186.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1021056253 is about 31953.9708487067. The cubic root of 1021056253 is about 1006.9700564408.

Adding to 1021056253 its reverse (3526501201), we get a palindrome (4547557454).

The spelling of 1021056253 in words is "one billion, twenty-one million, fifty-six thousand, two hundred fifty-three".