401002021 has 8 divisors (see below), whose sum is σ = 461208320. Its totient is φ = 341525808.

The previous prime is 401002013. The next prime is 401002027. The reversal of 401002021 is 120200104.

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

It is a cyclic number.

It is not a de Polignac number, because 401002021 - 2³ = 401002013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401001989 and 401002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401002027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181341 + ... + 183538.

It is an arithmetic number, because the mean of its divisors is an integer number (57651040).

Almost surely, 2^401002021 is an apocalyptic number.

It is an amenable number.

401002021 is a deficient number, since it is larger than the sum of its proper divisors (60206299).

401002021 is a wasteful number, since it uses less digits than its factorization.

401002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365043.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 401002021 is about 20025.0348563991. The cubic root of 401002021 is about 737.4210328549.

Adding to 401002021 its reverse (120200104), we get a palindrome (521202125).

The spelling of 401002021 in words is "four hundred one million, two thousand, twenty-one".