401145421 has 4 divisors (see below), whose sum is σ = 402514812. Its totient is φ = 399776032.

The previous prime is 401145419. The next prime is 401145467. The reversal of 401145421 is 124541104.

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 372104100 + 29041321 = 19290^2 + 5389^2 .

It is a cyclic number.

It is not a de Polignac number, because 401145421 - 2¹ = 401145419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401145392 and 401145401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401145401) 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 3 ways as a sum of consecutive naturals, for example, 684256 + ... + 684841.

It is an arithmetic number, because the mean of its divisors is an integer number (100628703).

Almost surely, 2^401145421 is an apocalyptic number.

It is an amenable number.

401145421 is a deficient number, since it is larger than the sum of its proper divisors (1369391).

401145421 is a wasteful number, since it uses less digits than its factorization.

401145421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369390.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 401145421 is about 20028.6150544664. The cubic root of 401145421 is about 737.5089239943.

Adding to 401145421 its reverse (124541104), we get a palindrome (525686525).

The spelling of 401145421 in words is "four hundred one million, one hundred forty-five thousand, four hundred twenty-one".