221221051 has 8 divisors (see below), whose sum is σ = 235347984. Its totient is φ = 207217920.

The previous prime is 221221037. The next prime is 221221067. The reversal of 221221051 is 150122122.

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 221221051 - 2¹¹ = 221219003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221081) 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, 27250 + ... + 34423.

It is an arithmetic number, because the mean of its divisors is an integer number (29418498).

Almost surely, 2^221221051 is an apocalyptic number.

221221051 is a deficient number, since it is larger than the sum of its proper divisors (14126933).

221221051 is a wasteful number, since it uses less digits than its factorization.

221221051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61901.

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

The square root of 221221051 is about 14873.5016388206. The cubic root of 221221051 is about 604.7958703909.

Adding to 221221051 its reverse (150122122), we get a palindrome (371343173).

The spelling of 221221051 in words is "two hundred twenty-one million, two hundred twenty-one thousand, fifty-one".