21000151423 has 2 divisors, whose sum is σ = 21000151424. Its totient is φ = 21000151422.

The previous prime is 21000151349. The next prime is 21000151427. The reversal of 21000151423 is 32415100012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000151423 - 2³³ = 12410216831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000151423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000151427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500075711 + 10500075712.

It is an arithmetic number, because the mean of its divisors is an integer number (10500075712).

Almost surely, 2^21000151423 is an apocalyptic number.

21000151423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000151423 is an equidigital number, since it uses as much as digits as its factorization.

21000151423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21000151423 its reverse (32415100012), we get a palindrome (53415251435).

The spelling of 21000151423 in words is "twenty-one billion, one hundred fifty-one thousand, four hundred twenty-three".