6401140221 has 16 divisors (see below), whose sum is σ = 9755836928. Its totient is φ = 3657150000.

The previous prime is 6401140199. The next prime is 6401140241. The reversal of 6401140221 is 1220411046.

It is a happy number.

It is not a de Polignac number, because 6401140221 - 2⁶ = 6401140157 is a prime.

It is a super-2 number, since 2×6401140221² = 81949192257807857682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401140241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111846 + ... + 159096.

It is an arithmetic number, because the mean of its divisors is an integer number (609739808).

Almost surely, 2^6401140221 is an apocalyptic number.

It is an amenable number.

6401140221 is a deficient number, since it is larger than the sum of its proper divisors (3354696707).

6401140221 is a wasteful number, since it uses less digits than its factorization.

6401140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53712.

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

The square root of 6401140221 is about 80007.1260638701. The cubic root of 6401140221 is about 1856.7457860033.

Adding to 6401140221 its reverse (1220411046), we get a palindrome (7621551267).

The spelling of 6401140221 in words is "six billion, four hundred one million, one hundred forty thousand, two hundred twenty-one".