221013421 has 8 divisors (see below), whose sum is σ = 226355360. Its totient is φ = 215680752.

The previous prime is 221013409. The next prime is 221013451. The reversal of 221013421 is 124310122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221013421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221013395 and 221013404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221013451) 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, 81790 + ... + 84448.

It is an arithmetic number, because the mean of its divisors is an integer number (28294420).

Almost surely, 2^221013421 is an apocalyptic number.

It is an amenable number.

221013421 is a deficient number, since it is larger than the sum of its proper divisors (5341939).

221013421 is a wasteful number, since it uses less digits than its factorization.

221013421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 221013421 is about 14866.5201375440. The cubic root of 221013421 is about 604.6065980577.

Adding to 221013421 its reverse (124310122), we get a palindrome (345323543).

The spelling of 221013421 in words is "two hundred twenty-one million, thirteen thousand, four hundred twenty-one".