2218726725021 has 6 divisors (see below), whose sum is σ = 3204827491710. Its totient is φ = 1479151150008.

The previous prime is 2218726725011. The next prime is 2218726725113. The reversal of 2218726725021 is 1205276278122.

2218726725021 is a `hidden beast` number, since 2 + 2 + 1 + 8 + 72 + 6 + 72 + 502 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2155056296121 + 63670428900 = 1468011^2 + 252330^2 .

It is not a de Polignac number, because 2218726725021 - 2⁹ = 2218726724509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218726725011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123262595826 + ... + 123262595843.

It is an arithmetic number, because the mean of its divisors is an integer number (534137915285).

Almost surely, 2^{2218726725021} is an apocalyptic number.

It is an amenable number.

2218726725021 is a deficient number, since it is larger than the sum of its proper divisors (986100766689).

2218726725021 is a wasteful number, since it uses less digits than its factorization.

2218726725021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246525191675 (or 246525191672 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 2218726725021 in words is "two trillion, two hundred eighteen billion, seven hundred twenty-six million, seven hundred twenty-five thousand, twenty-one".