400021401023 has 2 divisors, whose sum is σ = 400021401024. Its totient is φ = 400021401022.

The previous prime is 400021400983. The next prime is 400021401047. The reversal of 400021401023 is 320104120004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400021401023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400021400992 and 400021401010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400021401823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200010700511 + 200010700512.

It is an arithmetic number, because the mean of its divisors is an integer number (200010700512).

Almost surely, 2^400021401023 is an apocalyptic number.

400021401023 is a deficient number, since it is larger than the sum of its proper divisors (1).

400021401023 is an equidigital number, since it uses as much as digits as its factorization.

400021401023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 400021401023 its reverse (320104120004), we get a palindrome (720125521027).

The spelling of 400021401023 in words is "four hundred billion, twenty-one million, four hundred one thousand, twenty-three".