1020221197 has 4 divisors (see below), whose sum is σ = 1020305916. Its totient is φ = 1020136480.

The previous prime is 1020221179. The next prime is 1020221231. The reversal of 1020221197 is 7911220201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 336869316 + 683351881 = 18354^2 + 26141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020221197 - 2¹¹ = 1020219149 is a prime.

It is a super-2 number, since 2×1020221197² = 2081702581616225618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020221597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20554 + ... + 49627.

It is an arithmetic number, because the mean of its divisors is an integer number (255076479).

Almost surely, 2^1020221197 is an apocalyptic number.

It is an amenable number.

1020221197 is a deficient number, since it is larger than the sum of its proper divisors (84719).

1020221197 is an equidigital number, since it uses as much as digits as its factorization.

1020221197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84718.

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

The square root of 1020221197 is about 31940.9016309809. The cubic root of 1020221197 is about 1006.6954696353.

Adding to 1020221197 its reverse (7911220201), we get a palindrome (8931441398).

The spelling of 1020221197 in words is "one billion, twenty million, two hundred twenty-one thousand, one hundred ninety-seven".