221221231401 has 8 divisors (see below), whose sum is σ = 295144968160. Its totient is φ = 147389157792.

The previous prime is 221221231393. The next prime is 221221231409. The reversal of 221221231401 is 104132122122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221221231393) and next prime (221221231409).

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

It is not a de Polignac number, because 221221231401 - 2³ = 221221231393 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 22910155 + ... + 22919808.

It is an arithmetic number, because the mean of its divisors is an integer number (36893121020).

Almost surely, 2^221221231401 is an apocalyptic number.

It is an amenable number.

221221231401 is a deficient number, since it is larger than the sum of its proper divisors (73923736759).

221221231401 is a wasteful number, since it uses less digits than its factorization.

221221231401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45831575.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 221221231401 its reverse (104132122122), we get a palindrome (325353353523).

The spelling of 221221231401 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, four hundred one".