400021430719 has 2 divisors, whose sum is σ = 400021430720. Its totient is φ = 400021430718.

The previous prime is 400021430717. The next prime is 400021430773. The reversal of 400021430719 is 917034120004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400021430719 - 2¹ = 400021430717 is a prime.

It is a super-2 number, since 2×400021430719² (a number of 24 digits) contains 22 as substring.

Together with 400021430717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400021430717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200010715359 + 200010715360.

It is an arithmetic number, because the mean of its divisors is an integer number (200010715360).

Almost surely, 2^400021430719 is an apocalyptic number.

400021430719 is a deficient number, since it is larger than the sum of its proper divisors (1).

400021430719 is an equidigital number, since it uses as much as digits as its factorization.

400021430719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 400021430719 in words is "four hundred billion, twenty-one million, four hundred thirty thousand, seven hundred nineteen".