21920758471 has 4 divisors (see below), whose sum is σ = 22627879744. Its totient is φ = 21213637200.

The previous prime is 21920758463. The next prime is 21920758481. The reversal of 21920758471 is 17485702912.

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 21920758471 - 2³ = 21920758463 is a prime.

It is a super-3 number, since 3×21920758471³ (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 (21920758411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353560590 + ... + 353560651.

It is an arithmetic number, because the mean of its divisors is an integer number (5656969936).

Almost surely, 2^21920758471 is an apocalyptic number.

21920758471 is a deficient number, since it is larger than the sum of its proper divisors (707121273).

21920758471 is an equidigital number, since it uses as much as digits as its factorization.

21920758471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707121272.

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 21920758471 in words is "twenty-one billion, nine hundred twenty million, seven hundred fifty-eight thousand, four hundred seventy-one".