21501164150423 has 2 divisors, whose sum is σ = 21501164150424. Its totient is φ = 21501164150422.

The previous prime is 21501164150387. The next prime is 21501164150461. The reversal of 21501164150423 is 32405146110512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21501164150423 - 2²⁶ = 21501097041559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21501164150483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750582075211 + 10750582075212.

It is an arithmetic number, because the mean of its divisors is an integer number (10750582075212).

Almost surely, 2^{21501164150423} is an apocalyptic number.

21501164150423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21501164150423 is an equidigital number, since it uses as much as digits as its factorization.

21501164150423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 21501164150423 in words is "twenty-one trillion, five hundred one billion, one hundred sixty-four million, one hundred fifty thousand, four hundred twenty-three".