21719126471 has 12 divisors (see below), whose sum is σ = 25290864432. Its totient is φ = 18597414528.

The previous prime is 21719126453. The next prime is 21719126483. The reversal of 21719126471 is 17462191712.

It is a de Polignac number, because none of the positive numbers 2^k-21719126471 is a prime.

It is a super-3 number, since 3×21719126471³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21719126071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177290 + ... + 273623.

It is an arithmetic number, because the mean of its divisors is an integer number (2107572036).

Almost surely, 2^21719126471 is an apocalyptic number.

21719126471 is a deficient number, since it is larger than the sum of its proper divisors (3571737961).

21719126471 is an equidigital number, since it uses as much as digits as its factorization.

21719126471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451910 (or 451903 counting only the distinct ones).

The product of its digits is 42336, while the sum is 41.

The spelling of 21719126471 in words is "twenty-one billion, seven hundred nineteen million, one hundred twenty-six thousand, four hundred seventy-one".