1020421253 has 2 divisors, whose sum is σ = 1020421254. Its totient is φ = 1020421252.

The previous prime is 1020421247. The next prime is 1020421273. The reversal of 1020421253 is 3521240201.

It is an a-pointer prime, because the next prime (1020421273) can be obtained adding 1020421253 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 764964964 + 255456289 = 27658^2 + 15983^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020421253 - 2¹⁸ = 1020159109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020421273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510210626 + 510210627.

It is an arithmetic number, because the mean of its divisors is an integer number (510210627).

Almost surely, 2^1020421253 is an apocalyptic number.

It is an amenable number.

1020421253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020421253 is an equidigital number, since it uses as much as digits as its factorization.

1020421253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1020421253 is about 31944.0331360960. The cubic root of 1020421253 is about 1006.7612665778.

Adding to 1020421253 its reverse (3521240201), we get a palindrome (4541661454).

The spelling of 1020421253 in words is "one billion, twenty million, four hundred twenty-one thousand, two hundred fifty-three".