221056621206037 has 8 divisors (see below), whose sum is σ = 228681995448600. Its totient is φ = 213431429105664.

The previous prime is 221056621205999. The next prime is 221056621206049. The reversal of 221056621206037 is 730602126650122.

It can be written as a sum of positive squares in 4 ways, for example, as 167221985296356 + 53834635909681 = 12931434^2 + 7337209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221056621206037 - 2³⁵ = 221022261467669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221056621205984 and 221056621206002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221056621206437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43064112 + ... + 47923177.

It is an arithmetic number, because the mean of its divisors is an integer number (28585249431075).

Almost surely, 2^{221056621206037} is an apocalyptic number.

It is an amenable number.

221056621206037 is a deficient number, since it is larger than the sum of its proper divisors (7625374242563).

221056621206037 is an equidigital number, since it uses as much as digits as its factorization.

221056621206037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91071095.

The product of its (nonzero) digits is 362880, while the sum is 43.

Adding to 221056621206037 its reverse (730602126650122), we get a palindrome (951658747856159).

The spelling of 221056621206037 in words is "two hundred twenty-one trillion, fifty-six billion, six hundred twenty-one million, two hundred six thousand, thirty-seven".