400344032121 has 16 divisors (see below), whose sum is σ = 583087873728. Its totient is φ = 242312212800.

The previous prime is 400344032117. The next prime is 400344032159. The reversal of 400344032121 is 121230443004.

It is not a de Polignac number, because 400344032121 - 2² = 400344032117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400344032091 and 400344032100.

It is not an unprimeable number, because it can be changed into a prime (400344032171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7987990 + ... + 8037951.

It is an arithmetic number, because the mean of its divisors is an integer number (36442992108).

Almost surely, 2^400344032121 is an apocalyptic number.

It is an amenable number.

400344032121 is a deficient number, since it is larger than the sum of its proper divisors (182743841607).

400344032121 is a wasteful number, since it uses less digits than its factorization.

400344032121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16026712.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 400344032121 its reverse (121230443004), we get a palindrome (521574475125).

The spelling of 400344032121 in words is "four hundred billion, three hundred forty-four million, thirty-two thousand, one hundred twenty-one".