20211201097 has 4 divisors (see below), whose sum is σ = 20211633540. Its totient is φ = 20210768656.

The previous prime is 20211201071. The next prime is 20211201103. The reversal of 20211201097 is 79010211202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13937927481 + 6273273616 = 118059^2 + 79204^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211201097 - 2⁷ = 20211200969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211201497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136258 + ... + 242875.

It is an arithmetic number, because the mean of its divisors is an integer number (5052908385).

Almost surely, 2^20211201097 is an apocalyptic number.

It is an amenable number.

20211201097 is a deficient number, since it is larger than the sum of its proper divisors (432443).

20211201097 is an equidigital number, since it uses as much as digits as its factorization.

20211201097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432442.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 20211201097 its reverse (79010211202), we get a palindrome (99221412299).

The spelling of 20211201097 in words is "twenty billion, two hundred eleven million, two hundred one thousand, ninety-seven".