221502121 has 8 divisors (see below), whose sum is σ = 231992064. Its totient is φ = 211083840.

The previous prime is 221502101. The next prime is 221502137. The reversal of 221502121 is 121205122.

It is a happy number.

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 221502121 - 2¹¹ = 221500073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221502095 and 221502104.

It is not an unprimeable number, because it can be changed into a prime (221502101) 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, 11536 + ... + 24001.

It is an arithmetic number, because the mean of its divisors is an integer number (28999008).

Almost surely, 2^221502121 is an apocalyptic number.

It is an amenable number.

221502121 is a deficient number, since it is larger than the sum of its proper divisors (10489943).

221502121 is a wasteful number, since it uses less digits than its factorization.

221502121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35831.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221502121 is about 14882.9473223552. The cubic root of 221502121 is about 605.0519009273.

Adding to 221502121 its reverse (121205122), we get a palindrome (342707243).

The spelling of 221502121 in words is "two hundred twenty-one million, five hundred two thousand, one hundred twenty-one".