20021101197 has 16 divisors (see below), whose sum is σ = 26771703168. Its totient is φ = 13308986880.

The previous prime is 20021101189. The next prime is 20021101207. The reversal of 20021101197 is 79110112002.

It is not a de Polignac number, because 20021101197 - 2³ = 20021101189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021101147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3144297 + ... + 3150657.

It is an arithmetic number, because the mean of its divisors is an integer number (1673231448).

Almost surely, 2^20021101197 is an apocalyptic number.

It is an amenable number.

20021101197 is a deficient number, since it is larger than the sum of its proper divisors (6750601971).

20021101197 is a wasteful number, since it uses less digits than its factorization.

20021101197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220.

The product of its (nonzero) digits is 252, while the sum is 24.

Adding to 20021101197 its reverse (79110112002), we get a palindrome (99131213199).

The spelling of 20021101197 in words is "twenty billion, twenty-one million, one hundred one thousand, one hundred ninety-seven".