400021552213 has 4 divisors (see below), whose sum is σ = 400079794860. Its totient is φ = 399963309568.

The previous prime is 400021552201. The next prime is 400021552219. The reversal of 400021552213 is 312255120004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 155597113764 + 244424438449 = 394458^2 + 494393^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400021552213 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 (400021552219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29111020 + ... + 29124757.

It is an arithmetic number, because the mean of its divisors is an integer number (100019948715).

Almost surely, 2^400021552213 is an apocalyptic number.

It is an amenable number.

400021552213 is a deficient number, since it is larger than the sum of its proper divisors (58242647).

400021552213 is an equidigital number, since it uses as much as digits as its factorization.

400021552213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58242646.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 400021552213 its reverse (312255120004), we get a palindrome (712276672217).

The spelling of 400021552213 in words is "four hundred billion, twenty-one million, five hundred fifty-two thousand, two hundred thirteen".