220021221197 has 2 divisors, whose sum is σ = 220021221198. Its totient is φ = 220021221196.

The previous prime is 220021221193. The next prime is 220021221239. The reversal of 220021221197 is 791122120022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151436944201 + 68584276996 = 389149^2 + 261886^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021221197 - 2² = 220021221193 is a prime.

It is a super-2 number, since 2×220021221197² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220021221191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110010610598 + 110010610599.

It is an arithmetic number, because the mean of its divisors is an integer number (110010610599).

Almost surely, 2^220021221197 is an apocalyptic number.

It is an amenable number.

220021221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

220021221197 is an equidigital number, since it uses as much as digits as its factorization.

220021221197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 220021221197 in words is "two hundred twenty billion, twenty-one million, two hundred twenty-one thousand, one hundred ninety-seven".