401231021 has 16 divisors (see below), whose sum is σ = 424583424. Its totient is φ = 378411264.

The previous prime is 401230993. The next prime is 401231023. The reversal of 401231021 is 120132104.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401231021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401230987 and 401231005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401231023) 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 15 ways as a sum of consecutive naturals, for example, 823640 + ... + 824126.

It is an arithmetic number, because the mean of its divisors is an integer number (26536464).

Almost surely, 2^401231021 is an apocalyptic number.

It is an amenable number.

401231021 is a deficient number, since it is larger than the sum of its proper divisors (23352403).

401231021 is a wasteful number, since it uses less digits than its factorization.

401231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940.

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

The square root of 401231021 is about 20030.7518830422. The cubic root of 401231021 is about 737.5613790149.

Adding to 401231021 its reverse (120132104), we get a palindrome (521363125).

The spelling of 401231021 in words is "four hundred one million, two hundred thirty-one thousand, twenty-one".