21124201343012 has 12 divisors (see below), whose sum is σ = 36967435765260. Its totient is φ = 10562076838656.

The previous prime is 21124201342997. The next prime is 21124201343059. The reversal of 21124201343012 is 21034310242112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10440821463076 + 10683379879936 = 3231226^2 + 3268544^2 .

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, 3883673 + ... + 7571744.

It is an arithmetic number, because the mean of its divisors is an integer number (3080619647105).

Almost surely, 2^{21124201343012} is an apocalyptic number.

It is an amenable number.

21124201343012 is a deficient number, since it is larger than the sum of its proper divisors (15843234422248).

21124201343012 is a wasteful number, since it uses less digits than its factorization.

21124201343012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11916430 (or 11916428 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21124201343012 its reverse (21034310242112), we get a palindrome (42158511585124).

The spelling of 21124201343012 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred one million, three hundred forty-three thousand, twelve".