21601631152240 has 40 divisors (see below), whose sum is σ = 50224039986960. Its totient is φ = 8640609870336.

The previous prime is 21601631152229. The next prime is 21601631152243. The reversal of 21601631152240 is 4225113610612.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 21601631152196 and 21601631152205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601631152243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19438351 + ... + 20519569.

It is an arithmetic number, because the mean of its divisors is an integer number (1255600999674).

Almost surely, 2^{21601631152240} is an apocalyptic number.

21601631152240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21601631152240 is an abundant number, since it is smaller than the sum of its proper divisors (28622408834720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21601631152240 is a wasteful number, since it uses less digits than its factorization.

21601631152240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330969 (or 1330963 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 21601631152240 its reverse (4225113610612), we get a palindrome (25826744762852).

The spelling of 21601631152240 in words is "twenty-one trillion, six hundred one billion, six hundred thirty-one million, one hundred fifty-two thousand, two hundred forty".