400244220421 has 8 divisors (see below), whose sum is σ = 417684173760. Its totient is φ = 382807436352.

The previous prime is 400244220403. The next prime is 400244220433. The reversal of 400244220421 is 124022442004.

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 400244220421 - 2³¹ = 398096736773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400244220401) 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, 532420 + ... + 1041133.

It is an arithmetic number, because the mean of its divisors is an integer number (52210521720).

Almost surely, 2^400244220421 is an apocalyptic number.

It is an amenable number.

400244220421 is a deficient number, since it is larger than the sum of its proper divisors (17439953339).

400244220421 is a wasteful number, since it uses less digits than its factorization.

400244220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584635.

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 400244220421 its reverse (124022442004), we get a palindrome (524266662425).

The spelling of 400244220421 in words is "four hundred billion, two hundred forty-four million, two hundred twenty thousand, four hundred twenty-one".