21304121372 has 6 divisors (see below), whose sum is σ = 37282212408. Its totient is φ = 10652060684.

The previous prime is 21304121357. The next prime is 21304121407. The reversal of 21304121372 is 27312140312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663015168 + ... + 2663015175.

It is an arithmetic number, because the mean of its divisors is an integer number (6213702068).

Almost surely, 2^21304121372 is an apocalyptic number.

It is an amenable number.

21304121372 is a deficient number, since it is larger than the sum of its proper divisors (15978091036).

21304121372 is a wasteful number, since it uses less digits than its factorization.

21304121372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5326030347 (or 5326030345 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 21304121372 its reverse (27312140312), we get a palindrome (48616261684).

The spelling of 21304121372 in words is "twenty-one billion, three hundred four million, one hundred twenty-one thousand, three hundred seventy-two".