400153043021 has 2 divisors, whose sum is σ = 400153043022. Its totient is φ = 400153043020.

The previous prime is 400153042999. The next prime is 400153043071. The reversal of 400153043021 is 120340351004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360438133225 + 39714909796 = 600365^2 + 199286^2 .

It is a cyclic number.

It is not a de Polignac number, because 400153043021 - 2¹⁸ = 400152780877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400153043071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200076521510 + 200076521511.

It is an arithmetic number, because the mean of its divisors is an integer number (200076521511).

Almost surely, 2^400153043021 is an apocalyptic number.

It is an amenable number.

400153043021 is a deficient number, since it is larger than the sum of its proper divisors (1).

400153043021 is an equidigital number, since it uses as much as digits as its factorization.

400153043021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 400153043021 its reverse (120340351004), we get a palindrome (520493394025).

The spelling of 400153043021 in words is "four hundred billion, one hundred fifty-three million, forty-three thousand, twenty-one".