21400312444232 has 8 divisors (see below), whose sum is σ = 40125585832950. Its totient is φ = 10700156222112.

The previous prime is 21400312444171. The next prime is 21400312444237. The reversal of 21400312444232 is 23244421300412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21382245320836 + 18067123396 = 4624094^2 + 134414^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21400312444232² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21400312444237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1337519527757 + ... + 1337519527772.

Almost surely, 2^{21400312444232} is an apocalyptic number.

It is an amenable number.

21400312444232 is a deficient number, since it is larger than the sum of its proper divisors (18725273388718).

21400312444232 is a wasteful number, since it uses less digits than its factorization.

21400312444232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675039055535 (or 2675039055531 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 21400312444232 its reverse (23244421300412), we get a palindrome (44644733744644).

The spelling of 21400312444232 in words is "twenty-one trillion, four hundred billion, three hundred twelve million, four hundred forty-four thousand, two hundred thirty-two".