221424051 has 8 divisors (see below), whose sum is σ = 295441344. Its totient is φ = 147511400.

The previous prime is 221424029. The next prime is 221424061. The reversal of 221424051 is 150424122.

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 221424051 - 2⁶ = 221423987 is a prime.

It is a super-2 number, since 2×221424051² = 98057220722501202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221424001) 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, 21081 + ... + 29786.

It is an arithmetic number, because the mean of its divisors is an integer number (36930168).

Almost surely, 2^221424051 is an apocalyptic number.

221424051 is a deficient number, since it is larger than the sum of its proper divisors (74017293).

221424051 is a wasteful number, since it uses less digits than its factorization.

221424051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52321.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221424051 is about 14880.3242908211. The cubic root of 221424051 is about 604.9808076238.

Adding to 221424051 its reverse (150424122), we get a palindrome (371848173).

The spelling of 221424051 in words is "two hundred twenty-one million, four hundred twenty-four thousand, fifty-one".