21631615247246 has 4 divisors (see below), whose sum is σ = 32447422870872. Its totient is φ = 10815807623622.

The previous prime is 21631615247239. The next prime is 21631615247261. The reversal of 21631615247246 is 64274251613612.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21631615247194 and 21631615247203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5407903811810 + ... + 5407903811813.

It is an arithmetic number, because the mean of its divisors is an integer number (8111855717718).

Almost surely, 2^{21631615247246} is an apocalyptic number.

21631615247246 is a deficient number, since it is larger than the sum of its proper divisors (10815807623626).

21631615247246 is a wasteful number, since it uses less digits than its factorization.

21631615247246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10815807623625.

The product of its digits is 2903040, while the sum is 50.

The spelling of 21631615247246 in words is "twenty-one trillion, six hundred thirty-one billion, six hundred fifteen million, two hundred forty-seven thousand, two hundred forty-six".