221134421 has 2 divisors, whose sum is σ = 221134422. Its totient is φ = 221134420.

The previous prime is 221134411. The next prime is 221134457. The reversal of 221134421 is 124431122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190053796 + 31080625 = 13786^2 + 5575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221134421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221134393 and 221134402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221134411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110567210 + 110567211.

It is an arithmetic number, because the mean of its divisors is an integer number (110567211).

Almost surely, 2^221134421 is an apocalyptic number.

It is an amenable number.

221134421 is a deficient number, since it is larger than the sum of its proper divisors (1).

221134421 is an equidigital number, since it uses as much as digits as its factorization.

221134421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 221134421 is about 14870.5891275363. The cubic root of 221134421 is about 604.7169142117.

Adding to 221134421 its reverse (124431122), we get a palindrome (345565543).

The spelling of 221134421 in words is "two hundred twenty-one million, one hundred thirty-four thousand, four hundred twenty-one".