401321421 has 24 divisors (see below), whose sum is σ = 588454776. Its totient is φ = 263531520.

The previous prime is 401321419. The next prime is 401321423. The reversal of 401321421 is 124123104.

It is an interprime number because it is at equal distance from previous prime (401321419) and next prime (401321423).

It can be written as a sum of positive squares in 4 ways, for example, as 49196196 + 352125225 = 7014^2 + 18765^2 .

It is not a de Polignac number, because 401321421 - 2¹ = 401321419 is a prime.

It is a super-2 number, since 2×401321421² = 322117765906918482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401321394 and 401321403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401321423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174801 + ... + 177081.

It is an arithmetic number, because the mean of its divisors is an integer number (24518949).

Almost surely, 2^401321421 is an apocalyptic number.

It is an amenable number.

401321421 is a deficient number, since it is larger than the sum of its proper divisors (187133355).

401321421 is a wasteful number, since it uses less digits than its factorization.

401321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573 (or 2570 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 401321421 is about 20033.0082863258. The cubic root of 401321421 is about 737.6167673392.

Adding to 401321421 its reverse (124123104), we get a palindrome (525444525).

The spelling of 401321421 in words is "four hundred one million, three hundred twenty-one thousand, four hundred twenty-one".