400220211 has 4 divisors (see below), whose sum is σ = 533626952. Its totient is φ = 266813472.

The previous prime is 400220209. The next prime is 400220281. The reversal of 400220211 is 112022004.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 400220211 - 2¹ = 400220209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400220201) 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, 66703366 + ... + 66703371.

It is an arithmetic number, because the mean of its divisors is an integer number (133406738).

Almost surely, 2^400220211 is an apocalyptic number.

400220211 is a deficient number, since it is larger than the sum of its proper divisors (133406741).

400220211 is a wasteful number, since it uses less digits than its factorization.

400220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133406740.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 400220211 is about 20005.5045175072. The cubic root of 400220211 is about 736.9414856333.

Adding to 400220211 its reverse (112022004), we get a palindrome (512242215).

The spelling of 400220211 in words is "four hundred million, two hundred twenty thousand, two hundred eleven".