221620050601 has 4 divisors (see below), whose sum is σ = 221630938452. Its totient is φ = 221609162752.

The previous prime is 221620050529. The next prime is 221620050607. The reversal of 221620050601 is 106050026122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70065560601 + 151554490000 = 264699^2 + 389300^2 .

It is a cyclic number.

It is not a de Polignac number, because 221620050601 - 2⁷ = 221620050473 is a prime.

It is a super-2 number, since 2×221620050601² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221620050607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5413336 + ... + 5454121.

It is an arithmetic number, because the mean of its divisors is an integer number (55407734613).

Almost surely, 2^221620050601 is an apocalyptic number.

It is an amenable number.

221620050601 is a deficient number, since it is larger than the sum of its proper divisors (10887851).

221620050601 is a wasteful number, since it uses less digits than its factorization.

221620050601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10887850.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 221620050601 its reverse (106050026122), we get a palindrome (327670076723).

The spelling of 221620050601 in words is "two hundred twenty-one billion, six hundred twenty million, fifty thousand, six hundred one".