21475200788 has 12 divisors (see below), whose sum is σ = 37586011092. Its totient is φ = 10736340480.

The previous prime is 21475200781. The next prime is 21475200793. The reversal of 21475200788 is 88700257412.

It can be written as a sum of positive squares in 2 ways, for example, as 986713744 + 20488487044 = 31412^2 + 143138^2 .

It is a super-2 number, since 2×21475200788² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475200781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276095 + ... + 345222.

It is an arithmetic number, because the mean of its divisors is an integer number (3132167591).

Almost surely, 2^21475200788 is an apocalyptic number.

It is an amenable number.

21475200788 is a deficient number, since it is larger than the sum of its proper divisors (16110810304).

21475200788 is a wasteful number, since it uses less digits than its factorization.

21475200788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629962 (or 629960 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 44.

The spelling of 21475200788 in words is "twenty-one billion, four hundred seventy-five million, two hundred thousand, seven hundred eighty-eight".