1021203421253 has 4 divisors (see below), whose sum is σ = 1074950969760. Its totient is φ = 967455872748.

The previous prime is 1021203421213. The next prime is 1021203421321. The reversal of 1021203421253 is 3521243021201.

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 1021203421253 - 2¹⁰ = 1021203420229 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 (1021203421213) 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, 26873774225 + ... + 26873774262.

It is an arithmetic number, because the mean of its divisors is an integer number (268737742440).

Almost surely, 2^{1021203421253} is an apocalyptic number.

It is an amenable number.

1021203421253 is a deficient number, since it is larger than the sum of its proper divisors (53747548507).

1021203421253 is an equidigital number, since it uses as much as digits as its factorization.

1021203421253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53747548506.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 1021203421253 its reverse (3521243021201), we get a palindrome (4542446442454).

The spelling of 1021203421253 in words is "one trillion, twenty-one billion, two hundred three million, four hundred twenty-one thousand, two hundred fifty-three".