221743402 has 8 divisors (see below), whose sum is σ = 333665316. Its totient is φ = 110521632.

The previous prime is 221743351. The next prime is 221743409. The reversal of 221743402 is 204347122.

It is a happy number.

221743402 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 221741881 + 1521 = 14891^2 + 39^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221743409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174243 + ... + 175510.

Almost surely, 2^221743402 is an apocalyptic number.

221743402 is a deficient number, since it is larger than the sum of its proper divisors (111921914).

221743402 is a wasteful number, since it uses less digits than its factorization.

221743402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350072.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 221743402 is about 14891.0510710292. The cubic root of 221743402 is about 605.2715144030.

The spelling of 221743402 in words is "two hundred twenty-one million, seven hundred forty-three thousand, four hundred two".