2167202672221 has 16 divisors (see below), whose sum is σ = 2221583888304. Its totient is φ = 2113343325184.

The previous prime is 2167202672213. The next prime is 2167202672233. The reversal of 2167202672221 is 1222762027612.

It can be written as a sum of positive squares in 8 ways, for example, as 991788924996 + 1175413747225 = 995886^2 + 1084165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2167202672221 - 2³ = 2167202672213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2167202672281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10094631 + ... + 10307083.

It is an arithmetic number, because the mean of its divisors is an integer number (138848993019).

Almost surely, 2^{2167202672221} is an apocalyptic number.

It is an amenable number.

2167202672221 is a deficient number, since it is larger than the sum of its proper divisors (54381216083).

2167202672221 is a wasteful number, since it uses less digits than its factorization.

2167202672221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213680.

The product of its (nonzero) digits is 112896, while the sum is 40.

Adding to 2167202672221 its reverse (1222762027612), we get a palindrome (3389964699833).

The spelling of 2167202672221 in words is "two trillion, one hundred sixty-seven billion, two hundred two million, six hundred seventy-two thousand, two hundred twenty-one".