10202021243 has 4 divisors (see below), whose sum is σ = 10645587408. Its totient is φ = 9758455080.

The previous prime is 10202021237. The next prime is 10202021309. The reversal of 10202021243 is 34212020201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34212020201 = 263 ⋅130083727.

It is a cyclic number.

It is not a de Polignac number, because 10202021243 - 2⁴ = 10202021227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10202021213) 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, 221783048 + ... + 221783093.

It is an arithmetic number, because the mean of its divisors is an integer number (2661396852).

Almost surely, 2^10202021243 is an apocalyptic number.

10202021243 is a deficient number, since it is larger than the sum of its proper divisors (443566165).

10202021243 is an equidigital number, since it uses as much as digits as its factorization.

10202021243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443566164.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 10202021243 its reverse (34212020201), we get a palindrome (44414041444).

The spelling of 10202021243 in words is "ten billion, two hundred two million, twenty-one thousand, two hundred forty-three".