21275935988 has 24 divisors (see below), whose sum is σ = 38271267720. Its totient is φ = 10343060480.

The previous prime is 21275935973. The next prime is 21275936009. The reversal of 21275935988 is 88953957212.

It can be written as a sum of positive squares in 4 ways, for example, as 157452304 + 21118483684 = 12548^2 + 145322^2 .

It is a super-2 number, since 2×21275935988² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173333 + ... + 269436.

It is an arithmetic number, because the mean of its divisors is an integer number (1594636155).

Almost surely, 2^21275935988 is an apocalyptic number.

It is an amenable number.

21275935988 is a deficient number, since it is larger than the sum of its proper divisors (16995331732).

21275935988 is a wasteful number, since it uses less digits than its factorization.

21275935988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443107 (or 443105 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 59.

The spelling of 21275935988 in words is "twenty-one billion, two hundred seventy-five million, nine hundred thirty-five thousand, nine hundred eighty-eight".