21144514532 has 12 divisors (see below), whose sum is σ = 37509789996. Its totient is φ = 10427431680.

The previous prime is 21144514519. The next prime is 21144514543. The reversal of 21144514532 is 23541544112.

It can be written as a sum of positive squares in 2 ways, for example, as 10507480036 + 10637034496 = 102506^2 + 103136^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36206069 + ... + 36206652.

It is an arithmetic number, because the mean of its divisors is an integer number (3125815833).

Almost surely, 2^21144514532 is an apocalyptic number.

It is an amenable number.

21144514532 is a deficient number, since it is larger than the sum of its proper divisors (16365275464).

21144514532 is a wasteful number, since it uses less digits than its factorization.

21144514532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72412798 (or 72412796 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The spelling of 21144514532 in words is "twenty-one billion, one hundred forty-four million, five hundred fourteen thousand, five hundred thirty-two".