221001401 has 4 divisors (see below), whose sum is σ = 221192592. Its totient is φ = 220810212.

The previous prime is 221001397. The next prime is 221001409. The reversal of 221001401 is 104100122.

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.

It is a cyclic number.

It is not a de Polignac number, because 221001401 - 2² = 221001397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001409) 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, 93851 + ... + 96176.

It is an arithmetic number, because the mean of its divisors is an integer number (55298148).

Almost surely, 2^221001401 is an apocalyptic number.

It is an amenable number.

221001401 is a deficient number, since it is larger than the sum of its proper divisors (191191).

221001401 is a wasteful number, since it uses less digits than its factorization.

221001401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191190.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221001401 is about 14866.1158679730. The cubic root of 221001401 is about 604.5956371803.

Adding to 221001401 its reverse (104100122), we get a palindrome (325101523).

The spelling of 221001401 in words is "two hundred twenty-one million, one thousand, four hundred one".