21167829523 has 2 divisors, whose sum is σ = 21167829524. Its totient is φ = 21167829522.

The previous prime is 21167829517. The next prime is 21167829577. The reversal of 21167829523 is 32592876112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21167829523 - 2¹³ = 21167821331 is a prime.

It is not a weakly prime, because it can be changed into another prime (21167829923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10583914761 + 10583914762.

It is an arithmetic number, because the mean of its divisors is an integer number (10583914762).

Almost surely, 2^21167829523 is an apocalyptic number.

21167829523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21167829523 is an equidigital number, since it uses as much as digits as its factorization.

21167829523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The spelling of 21167829523 in words is "twenty-one billion, one hundred sixty-seven million, eight hundred twenty-nine thousand, five hundred twenty-three".