400335445021 has 8 divisors (see below), whose sum is σ = 404243618040. Its totient is φ = 396441562368.

The previous prime is 400335445009. The next prime is 400335445031. The reversal of 400335445021 is 120544533004.

It can be written as a sum of positive squares in 4 ways, for example, as 137704819396 + 262630625625 = 371086^2 + 512475^2 .

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 400335445021 - 2⁵ = 400335444989 is a prime.

It is a super-2 number, since 2×400335445021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400335445031) 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, 3516286 + ... + 3628351.

It is an arithmetic number, because the mean of its divisors is an integer number (50530452255).

Almost surely, 2^400335445021 is an apocalyptic number.

It is an amenable number.

400335445021 is a deficient number, since it is larger than the sum of its proper divisors (3908173019).

400335445021 is a wasteful number, since it uses less digits than its factorization.

400335445021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7145183.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 400335445021 its reverse (120544533004), we get a palindrome (520879978025).

The spelling of 400335445021 in words is "four hundred billion, three hundred thirty-five million, four hundred forty-five thousand, twenty-one".