400214121 has 4 divisors (see below), whose sum is σ = 533618832. Its totient is φ = 266809412.

The previous prime is 400214093. The next prime is 400214137. The reversal of 400214121 is 121412004.

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 400214121 - 2¹¹ = 400212073 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400214121.

It is not an unprimeable number, because it can be changed into a prime (400215121) 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, 66702351 + ... + 66702356.

It is an arithmetic number, because the mean of its divisors is an integer number (133404708).

Almost surely, 2^400214121 is an apocalyptic number.

It is an amenable number.

400214121 is a deficient number, since it is larger than the sum of its proper divisors (133404711).

400214121 is a wasteful number, since it uses less digits than its factorization.

400214121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133404710.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 400214121 is about 20005.3523088198. The cubic root of 400214121 is about 736.9377476941.

Adding to 400214121 its reverse (121412004), we get a palindrome (521626125).

The spelling of 400214121 in words is "four hundred million, two hundred fourteen thousand, one hundred twenty-one".