21641554314336 has 48 divisors (see below), whose sum is σ = 61973541903168. Its totient is φ = 6558046761600.

The previous prime is 21641554314241. The next prime is 21641554314343. The reversal of 21641554314336 is 63341345514612.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 10246947010 + ... + 10246949121.

It is an arithmetic number, because the mean of its divisors is an integer number (1291115456316).

Almost surely, 2^{21641554314336} is an apocalyptic number.

It is an amenable number.

21641554314336 is an abundant number, since it is smaller than the sum of its proper divisors (40331987588832).

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

21641554314336 is a wasteful number, since it uses less digits than its factorization.

21641554314336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20493896155 (or 20493896147 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 48.

Adding to 21641554314336 its reverse (63341345514612), we get a palindrome (84982899828948).

The spelling of 21641554314336 in words is "twenty-one trillion, six hundred forty-one billion, five hundred fifty-four million, three hundred fourteen thousand, three hundred thirty-six".