400021430722 has 8 divisors (see below), whose sum is σ = 601640812476. Its totient is φ = 199474493232.

The previous prime is 400021430719. The next prime is 400021430773. The reversal of 400021430722 is 227034120004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 376027730521 + 23993700201 = 613211^2 + 154899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268110133 + ... + 268111624.

Almost surely, 2^400021430722 is an apocalyptic number.

400021430722 is a deficient number, since it is larger than the sum of its proper divisors (201619381754).

400021430722 is a wasteful number, since it uses less digits than its factorization.

400021430722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536222132.

The product of its (nonzero) digits is 2688, while the sum is 25.

Adding to 400021430722 its reverse (227034120004), we get a palindrome (627055550726).

The spelling of 400021430722 in words is "four hundred billion, twenty-one million, four hundred thirty thousand, seven hundred twenty-two".