221501401 has 8 divisors (see below), whose sum is σ = 242193600. Its totient is φ = 200901840.

The previous prime is 221501387. The next prime is 221501429. The reversal of 221501401 is 104105122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221501401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221501461) 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, 18106 + ... + 27763.

It is an arithmetic number, because the mean of its divisors is an integer number (30274200).

Almost surely, 2^221501401 is an apocalyptic number.

It is an amenable number.

221501401 is a deficient number, since it is larger than the sum of its proper divisors (20692199).

221501401 is a wasteful number, since it uses less digits than its factorization.

221501401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46319.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221501401 is about 14882.9231335783. The cubic root of 221501401 is about 605.0512453462.

Adding to 221501401 its reverse (104105122), we get a palindrome (325606523).

The spelling of 221501401 in words is "two hundred twenty-one million, five hundred one thousand, four hundred one".