21112019987423 has 2 divisors, whose sum is σ = 21112019987424. Its totient is φ = 21112019987422.

The previous prime is 21112019987411. The next prime is 21112019987501. The reversal of 21112019987423 is 32478991021112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112019987423 - 2¹⁶ = 21112019921887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112019987923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556009993711 + 10556009993712.

It is an arithmetic number, because the mean of its divisors is an integer number (10556009993712).

Almost surely, 2^{21112019987423} is an apocalyptic number.

21112019987423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112019987423 is an equidigital number, since it uses as much as digits as its factorization.

21112019987423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 21112019987423 in words is "twenty-one trillion, one hundred twelve billion, nineteen million, nine hundred eighty-seven thousand, four hundred twenty-three".