401213421 has 36 divisors (see below), whose sum is σ = 676061724. Its totient is φ = 228614400.

The previous prime is 401213411. The next prime is 401213431. The reversal of 401213421 is 124312104.

It is an interprime number because it is at equal distance from previous prime (401213411) and next prime (401213431).

It can be written as a sum of positive squares in 2 ways, for example, as 89302500 + 311910921 = 9450^2 + 17661^2 .

It is not a de Polignac number, because 401213421 - 2²⁶ = 334104557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 401213394 and 401213403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401213401) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 184581 + ... + 186741.

Almost surely, 2^401213421 is an apocalyptic number.

It is an amenable number.

401213421 is a deficient number, since it is larger than the sum of its proper divisors (274848303).

401213421 is a wasteful number, since it uses less digits than its factorization.

401213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602 (or 2592 counting only the distinct ones).

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

The square root of 401213421 is about 20030.3125537272. The cubic root of 401213421 is about 737.5505944798.

Adding to 401213421 its reverse (124312104), we get a palindrome (525525525).

The spelling of 401213421 in words is "four hundred one million, two hundred thirteen thousand, four hundred twenty-one".