400121111 has 8 divisors (see below), whose sum is σ = 432183024. Its totient is φ = 368242560.

The previous prime is 400121107. The next prime is 400121131. The reversal of 400121111 is 111121004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400121111 - 2² = 400121107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400121092 and 400121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400121101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41285 + ... + 50046.

It is an arithmetic number, because the mean of its divisors is an integer number (54022878).

Almost surely, 2^400121111 is an apocalyptic number.

400121111 is a deficient number, since it is larger than the sum of its proper divisors (32061913).

400121111 is a wasteful number, since it uses less digits than its factorization.

400121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91681.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 400121111 is about 20003.0275458492. The cubic root of 400121111 is about 736.8806550140.

Adding to 400121111 its reverse (111121004), we get a palindrome (511242115).

The spelling of 400121111 in words is "four hundred million, one hundred twenty-one thousand, one hundred eleven".