221033421 has 32 divisors (see below), whose sum is σ = 375409920. Its totient is φ = 125908992.

The previous prime is 221033377. The next prime is 221033429. The reversal of 221033421 is 124330122.

221033421 is a `hidden beast` number, since 2 + 210 + 33 + 421 = 666.

It is not a de Polignac number, because 221033421 - 2⁶ = 221033357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221033394 and 221033403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221033429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65061 + ... + 68373.

It is an arithmetic number, because the mean of its divisors is an integer number (11731560).

Almost surely, 2^221033421 is an apocalyptic number.

221033421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221033421 is a deficient number, since it is larger than the sum of its proper divisors (154376499).

221033421 is a wasteful number, since it uses less digits than its factorization.

221033421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3682 (or 3676 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221033421 is about 14867.1927746969. The cubic root of 221033421 is about 604.6248349099.

Adding to 221033421 its reverse (124330122), we get a palindrome (345363543).

The spelling of 221033421 in words is "two hundred twenty-one million, thirty-three thousand, four hundred twenty-one".