21734419021 has 24 divisors (see below), whose sum is σ = 26292796992. Its totient is φ = 17588606400.

The previous prime is 21734419001. The next prime is 21734419027. The reversal of 21734419021 is 12091443712.

It is not a de Polignac number, because 21734419021 - 2⁹ = 21734418509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734419027) 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 in 23 ways as a sum of consecutive naturals, for example, 236406 + ... + 315208.

It is an arithmetic number, because the mean of its divisors is an integer number (1095533208).

Almost surely, 2^21734419021 is an apocalyptic number.

It is an amenable number.

21734419021 is a deficient number, since it is larger than the sum of its proper divisors (4558377971).

21734419021 is an equidigital number, since it uses as much as digits as its factorization.

21734419021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78913 (or 78882 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 21734419021 in words is "twenty-one billion, seven hundred thirty-four million, four hundred nineteen thousand, twenty-one".