221634629 has 4 divisors (see below), whose sum is σ = 223102560. Its totient is φ = 220166700.

The previous prime is 221634619. The next prime is 221634631. The reversal of 221634629 is 926436122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 926436122 = 2 ⋅463218061.

It is a cyclic number.

It is not a de Polignac number, because 221634629 - 2⁴ = 221634613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221634619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 733739 + ... + 734040.

It is an arithmetic number, because the mean of its divisors is an integer number (55775640).

Almost surely, 2^221634629 is an apocalyptic number.

It is an amenable number.

221634629 is a deficient number, since it is larger than the sum of its proper divisors (1467931).

221634629 is a wasteful number, since it uses less digits than its factorization.

221634629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467930.

The product of its digits is 31104, while the sum is 35.

The square root of 221634629 is about 14887.3983287880. The cubic root of 221634629 is about 605.1725291706.

The spelling of 221634629 in words is "two hundred twenty-one million, six hundred thirty-four thousand, six hundred twenty-nine".