202021020091 has 8 divisors (see below), whose sum is σ = 220553416368. Its totient is φ = 183516432000.

The previous prime is 202021020083. The next prime is 202021020101. The reversal of 202021020091 is 190020120202.

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

It is not a de Polignac number, because 202021020091 - 2³ = 202021020083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202021020041) 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, 6936850 + ... + 6965911.

It is an arithmetic number, because the mean of its divisors is an integer number (27569177046).

Almost surely, 2^202021020091 is an apocalyptic number.

202021020091 is a deficient number, since it is larger than the sum of its proper divisors (18532396277).

202021020091 is a wasteful number, since it uses less digits than its factorization.

202021020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13904093.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 202021020091 its reverse (190020120202), we get a palindrome (392041140293).

The spelling of 202021020091 in words is "two hundred two billion, twenty-one million, twenty thousand, ninety-one".