401221005 has 16 divisors (see below), whose sum is σ = 675741120. Its totient is φ = 202722048.

The previous prime is 401220997. The next prime is 401221027. The reversal of 401221005 is 500122104.

It is not a de Polignac number, because 401221005 - 2³ = 401220997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703612 + ... + 704181.

It is an arithmetic number, because the mean of its divisors is an integer number (42233820).

Almost surely, 2^401221005 is an apocalyptic number.

It is an amenable number.

401221005 is a deficient number, since it is larger than the sum of its proper divisors (274520115).

401221005 is a wasteful number, since it uses less digits than its factorization.

401221005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407820.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 401221005 is about 20030.5018659044. The cubic root of 401221005 is about 737.5552416727. Note that the first 3 decimals are identical.

Adding to 401221005 its reverse (500122104), we get a palindrome (901343109).

The spelling of 401221005 in words is "four hundred one million, two hundred twenty-one thousand, five".