221540566213 has 16 divisors (see below), whose sum is σ = 238055723136. Its totient is φ = 205661776320.

The previous prime is 221540566207. The next prime is 221540566217. The reversal of 221540566213 is 312665045122.

It is a cyclic number.

It is not a de Polignac number, because 221540566213 - 2¹³ = 221540558021 is a prime.

It is a super-2 number, since 2×221540566213² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221540566217) 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, 558118 + ... + 868663.

It is an arithmetic number, because the mean of its divisors is an integer number (14878482696).

Almost surely, 2^221540566213 is an apocalyptic number.

221540566213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

221540566213 is a deficient number, since it is larger than the sum of its proper divisors (16515156923).

221540566213 is a wasteful number, since it uses less digits than its factorization.

221540566213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427004.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 221540566213 in words is "two hundred twenty-one billion, five hundred forty million, five hundred sixty-six thousand, two hundred thirteen".