221984629 has 2 divisors, whose sum is σ = 221984630. Its totient is φ = 221984628.

The previous prime is 221984627. The next prime is 221984663. The reversal of 221984629 is 926489122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221950404 + 34225 = 14898^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 221984629 - 2¹ = 221984627 is a prime.

Together with 221984627, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221984627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110992314 + 110992315.

It is an arithmetic number, because the mean of its divisors is an integer number (110992315).

Almost surely, 2^221984629 is an apocalyptic number.

It is an amenable number.

221984629 is a deficient number, since it is larger than the sum of its proper divisors (1).

221984629 is an equidigital number, since it uses as much as digits as its factorization.

221984629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 221984629 is about 14899.1485998362. The cubic root of 221984629 is about 605.4909195302.

The spelling of 221984629 in words is "two hundred twenty-one million, nine hundred eighty-four thousand, six hundred twenty-nine".