401321021 has 8 divisors (see below), whose sum is σ = 432268320. Its totient is φ = 371356272.

The previous prime is 401321017. The next prime is 401321029. The reversal of 401321021 is 120123104.

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 401321021 - 2² = 401321017 is a prime.

It is a super-2 number, since 2×401321021² = 322117123792964882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401320987 and 401321005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401321029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244790 + ... + 246423.

It is an arithmetic number, because the mean of its divisors is an integer number (54033540).

Almost surely, 2^401321021 is an apocalyptic number.

It is an amenable number.

401321021 is a deficient number, since it is larger than the sum of its proper divisors (30947299).

401321021 is a wasteful number, since it uses less digits than its factorization.

401321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491275.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 401321021 is about 20032.9983028003. The cubic root of 401321021 is about 737.6165222765.

Adding to 401321021 its reverse (120123104), we get a palindrome (521444125).

The spelling of 401321021 in words is "four hundred one million, three hundred twenty-one thousand, twenty-one".