400222021 has 4 divisors (see below), whose sum is σ = 406195552. Its totient is φ = 394248492.

The previous prime is 400222019. The next prime is 400222063. The reversal of 400222021 is 120222004.

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 not a de Polignac number, because 400222021 - 2¹ = 400222019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400221992 and 400222010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400222001) 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, 2986665 + ... + 2986798.

It is an arithmetic number, because the mean of its divisors is an integer number (101548888).

Almost surely, 2^400222021 is an apocalyptic number.

It is an amenable number.

400222021 is a deficient number, since it is larger than the sum of its proper divisors (5973531).

400222021 is an equidigital number, since it uses as much as digits as its factorization.

400222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5973530.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 400222021 is about 20005.5497550055. The cubic root of 400222021 is about 736.9425965734.

Adding to 400222021 its reverse (120222004), we get a palindrome (520444025).

The spelling of 400222021 in words is "four hundred million, two hundred twenty-two thousand, twenty-one".