401311021 has 4 divisors (see below), whose sum is σ = 401475772. Its totient is φ = 401146272.

The previous prime is 401311007. The next prime is 401311037. The reversal of 401311021 is 120113104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146748996 + 254562025 = 12114^2 + 15955^2 .

It is a cyclic number.

It is not a de Polignac number, because 401311021 - 2¹⁵ = 401278253 is a prime.

It is a super-2 number, since 2×401311021² = 322101071152124882, 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 = 401310992 and 401311010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401311091) 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 3 ways as a sum of consecutive naturals, for example, 78666 + ... + 83611.

It is an arithmetic number, because the mean of its divisors is an integer number (100368943).

Almost surely, 2^401311021 is an apocalyptic number.

It is an amenable number.

401311021 is a deficient number, since it is larger than the sum of its proper divisors (164751).

401311021 is a wasteful number, since it uses less digits than its factorization.

401311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164750.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 401311021 is about 20032.7487130448. The cubic root of 401311021 is about 737.6103956546.

Adding to 401311021 its reverse (120113104), we get a palindrome (521424125).

The spelling of 401311021 in words is "four hundred one million, three hundred eleven thousand, twenty-one".