20213331197 has 2 divisors, whose sum is σ = 20213331198. Its totient is φ = 20213331196.

The previous prime is 20213331191. The next prime is 20213331263. The reversal of 20213331197 is 79113331202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17515463716 + 2697867481 = 132346^2 + 51941^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213331197 - 2⁶ = 20213331133 is a prime.

It is a super-2 number, since 2×20213331197² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213331191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106665598 + 10106665599.

It is an arithmetic number, because the mean of its divisors is an integer number (10106665599).

Almost surely, 2^20213331197 is an apocalyptic number.

It is an amenable number.

20213331197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213331197 is an equidigital number, since it uses as much as digits as its factorization.

20213331197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

Adding to 20213331197 its reverse (79113331202), we get a palindrome (99326662399).

The spelling of 20213331197 in words is "twenty billion, two hundred thirteen million, three hundred thirty-one thousand, one hundred ninety-seven".