10202021191 has 4 divisors (see below), whose sum is σ = 10354290232. Its totient is φ = 10049752152.

The previous prime is 10202021119. The next prime is 10202021213. The reversal of 10202021191 is 19112020201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10202021191 is a prime.

It is a super-2 number, since 2×10202021191² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202021591) 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, 76134420 + ... + 76134553.

It is an arithmetic number, because the mean of its divisors is an integer number (2588572558).

Almost surely, 2^10202021191 is an apocalyptic number.

10202021191 is a deficient number, since it is larger than the sum of its proper divisors (152269041).

10202021191 is an equidigital number, since it uses as much as digits as its factorization.

10202021191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152269040.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 10202021191 its reverse (19112020201), we get a palindrome (29314041392).

The spelling of 10202021191 in words is "ten billion, two hundred two million, twenty-one thousand, one hundred ninety-one".