202012202091 has 8 divisors (see below), whose sum is σ = 307828117504. Its totient is φ = 115435544040.

The previous prime is 202012202009. The next prime is 202012202131. The reversal of 202012202091 is 190202210202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202012202091 - 2¹⁵ = 202012169323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 9619628671 = 202012202091 / (2 + 0 + 2 + 0 + 1 + 2 + 2 + 0 + 2 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202012203091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4809814315 + ... + 4809814356.

It is an arithmetic number, because the mean of its divisors is an integer number (38478514688).

Almost surely, 2^202012202091 is an apocalyptic number.

202012202091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

202012202091 is a deficient number, since it is larger than the sum of its proper divisors (105815915413).

202012202091 is an equidigital number, since it uses as much as digits as its factorization.

202012202091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9619628681.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 202012202091 its reverse (190202210202), we get a palindrome (392214412293).

The spelling of 202012202091 in words is "two hundred two billion, twelve million, two hundred two thousand, ninety-one".