400212111 has 32 divisors (see below), whose sum is σ = 592562880. Its totient is φ = 240115200.

The previous prime is 400212083. The next prime is 400212149. The reversal of 400212111 is 111212004.

It is a happy number.

It is not a de Polignac number, because 400212111 - 2⁹ = 400211599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400211111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269491 + ... + 270971.

It is an arithmetic number, because the mean of its divisors is an integer number (18517590).

Almost surely, 2^400212111 is an apocalyptic number.

400212111 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

400212111 is a deficient number, since it is larger than the sum of its proper divisors (192350769).

400212111 is a wasteful number, since it uses less digits than its factorization.

400212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 400212111 is about 20005.3020722008. The cubic root of 400212111 is about 736.9365139818.

Adding to 400212111 its reverse (111212004), we get a palindrome (511424115).

The spelling of 400212111 in words is "four hundred million, two hundred twelve thousand, one hundred eleven".