2197720026 has 20 divisors (see below), whose sum is σ = 4924521162. Its totient is φ = 732573288.

The previous prime is 2197719991. The next prime is 2197720037. The reversal of 2197720026 is 6200277912.

It can be written as a sum of positive squares in only one way, i.e., 2115908001 + 81812025 = 45999^2 + 9045^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6782925 + ... + 6783248.

Almost surely, 2^2197720026 is an apocalyptic number.

2197720026 is an abundant number, since it is smaller than the sum of its proper divisors (2726801136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2197720026 is a wasteful number, since it uses less digits than its factorization.

2197720026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13566187 (or 13566178 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 2197720026 is about 46879.8466934353. The cubic root of 2197720026 is about 1300.1420014509.

Adding to 2197720026 its reverse (6200277912), we get a palindrome (8397997938).

The spelling of 2197720026 in words is "two billion, one hundred ninety-seven million, seven hundred twenty thousand, twenty-six".