221420623 has 8 divisors (see below), whose sum is σ = 238759920. Its totient is φ = 204649920.

The previous prime is 221420621. The next prime is 221420629. The reversal of 221420623 is 326024122.

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 221420623 - 2¹ = 221420621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221420594 and 221420603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221420621) 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, 141340 + ... + 142897.

It is an arithmetic number, because the mean of its divisors is an integer number (29844990).

Almost surely, 2^221420623 is an apocalyptic number.

221420623 is a deficient number, since it is larger than the sum of its proper divisors (17339297).

221420623 is a wasteful number, since it uses less digits than its factorization.

221420623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284297.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 221420623 is about 14880.2091047135. The cubic root of 221420623 is about 604.9776855827.

Adding to 221420623 its reverse (326024122), we get a palindrome (547444745).

The spelling of 221420623 in words is "two hundred twenty-one million, four hundred twenty thousand, six hundred twenty-three".