400254330221 has 4 divisors (see below), whose sum is σ = 400255840512. Its totient is φ = 400252819932.

The previous prime is 400254330181. The next prime is 400254330227. The reversal of 400254330221 is 122033452004.

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 a de Polignac number, because none of the positive numbers 2^k-400254330221 is a prime.

It is a super-2 number, since 2×400254330221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400254330227) 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, 240875 + ... + 926568.

It is an arithmetic number, because the mean of its divisors is an integer number (100063960128).

Almost surely, 2^400254330221 is an apocalyptic number.

It is an amenable number.

400254330221 is a deficient number, since it is larger than the sum of its proper divisors (1510291).

400254330221 is a wasteful number, since it uses less digits than its factorization.

400254330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510290.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 400254330221 its reverse (122033452004), we get a palindrome (522287782225).

The spelling of 400254330221 in words is "four hundred billion, two hundred fifty-four million, three hundred thirty thousand, two hundred twenty-one".