221420224051 has 4 divisors (see below), whose sum is σ = 238452548992. Its totient is φ = 204387899112.

The previous prime is 221420224043. The next prime is 221420224073. The reversal of 221420224051 is 150422024122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221420224051 - 2³ = 221420224043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221420224351) 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, 8516162451 + ... + 8516162476.

It is an arithmetic number, because the mean of its divisors is an integer number (59613137248).

Almost surely, 2^221420224051 is an apocalyptic number.

221420224051 is a deficient number, since it is larger than the sum of its proper divisors (17032324941).

221420224051 is a wasteful number, since it uses less digits than its factorization.

221420224051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17032324940.

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 221420224051 its reverse (150422024122), we get a palindrome (371842248173).

The spelling of 221420224051 in words is "two hundred twenty-one billion, four hundred twenty million, two hundred twenty-four thousand, fifty-one".