21601631152372 has 24 divisors (see below), whose sum is σ = 39800781316800. Its totient is φ = 10230216572736.

The previous prime is 21601631152357. The next prime is 21601631152403. The reversal of 21601631152372 is 27325113610612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29286472 + ... + 30015007.

It is an arithmetic number, because the mean of its divisors is an integer number (1658365888200).

Almost surely, 2^{21601631152372} is an apocalyptic number.

It is an amenable number.

21601631152372 is a deficient number, since it is larger than the sum of its proper divisors (18199150164428).

21601631152372 is a wasteful number, since it uses less digits than its factorization.

21601631152372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59306295 (or 59306293 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

Adding to 21601631152372 its reverse (27325113610612), we get a palindrome (48926744762984).

The spelling of 21601631152372 in words is "twenty-one trillion, six hundred one billion, six hundred thirty-one million, one hundred fifty-two thousand, three hundred seventy-two".