401342021 has 4 divisors (see below), whose sum is σ = 402649632. Its totient is φ = 400034412.

The previous prime is 401342009. The next prime is 401342047. The reversal of 401342021 is 120243104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401342021 - 2⁶ = 401341957 is a prime.

It is a super-3 number, since 3×401342021³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401342621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653345 + ... + 653958.

It is an arithmetic number, because the mean of its divisors is an integer number (100662408).

Almost surely, 2^401342021 is an apocalyptic number.

It is an amenable number.

401342021 is a deficient number, since it is larger than the sum of its proper divisors (1307611).

401342021 is a wasteful number, since it uses less digits than its factorization.

401342021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307610.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 401342021 is about 20033.5224311652. The cubic root of 401342021 is about 737.6293878512.

Adding to 401342021 its reverse (120243104), we get a palindrome (521585125).

The spelling of 401342021 in words is "four hundred one million, three hundred forty-two thousand, twenty-one".