21225489571 has 8 divisors (see below), whose sum is σ = 24936239664. Its totient is φ = 17811599520.

The previous prime is 21225489559. The next prime is 21225489577. The reversal of 21225489571 is 17598452212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21225489571 - 2⁵ = 21225489539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21225489577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74214856 + ... + 74215141.

It is an arithmetic number, because the mean of its divisors is an integer number (3117029958).

Almost surely, 2^21225489571 is an apocalyptic number.

21225489571 is a deficient number, since it is larger than the sum of its proper divisors (3710750093).

21225489571 is a wasteful number, since it uses less digits than its factorization.

21225489571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148430021.

The product of its digits is 403200, while the sum is 46.

The spelling of 21225489571 in words is "twenty-one billion, two hundred twenty-five million, four hundred eighty-nine thousand, five hundred seventy-one".