221221231402 has 8 divisors (see below), whose sum is σ = 332427597156. Its totient is φ = 110412032352.

The previous prime is 221221231393. The next prime is 221221231409. The reversal of 221221231402 is 204132122122.

221221231402 is digitally balanced in base 3, because in such base 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 206033380281 + 15187851121 = 453909^2 + 123239^2 .

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 (221221231409) 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, 99290283 + ... + 99292510.

Almost surely, 2^221221231402 is an apocalyptic number.

221221231402 is a deficient number, since it is larger than the sum of its proper divisors (111206365754).

221221231402 is a wasteful number, since it uses less digits than its factorization.

221221231402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198583352.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 221221231402 its reverse (204132122122), we get a palindrome (425353353524).

The spelling of 221221231402 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, four hundred two".