21969280471 has 4 divisors (see below), whose sum is σ = 21969613944. Its totient is φ = 21968947000.

The previous prime is 21969280451. The next prime is 21969280481. The reversal of 21969280471 is 17408296912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21969280471 - 2²³ = 21960891863 is a prime.

It is a super-3 number, since 3×21969280471³ (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 (21969280451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31180 + ... + 211921.

It is an arithmetic number, because the mean of its divisors is an integer number (5492403486).

Almost surely, 2^21969280471 is an apocalyptic number.

21969280471 is a deficient number, since it is larger than the sum of its proper divisors (333473).

21969280471 is an equidigital number, since it uses as much as digits as its factorization.

21969280471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333472.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 21969280471 in words is "twenty-one billion, nine hundred sixty-nine million, two hundred eighty thousand, four hundred seventy-one".