21541071663344 has 40 divisors (see below), whose sum is σ = 41754524883120. Its totient is φ = 10765711490048.

The previous prime is 21541071663337. The next prime is 21541071663407. The reversal of 21541071663344 is 44336617014512.

It is a happy number.

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, 371901074 + ... + 371958990.

It is an arithmetic number, because the mean of its divisors is an integer number (1043863122078).

Almost surely, 2^{21541071663344} is an apocalyptic number.

It is an amenable number.

21541071663344 is a deficient number, since it is larger than the sum of its proper divisors (20213453219776).

21541071663344 is a wasteful number, since it uses less digits than its factorization.

21541071663344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67937 (or 67931 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

Adding to 21541071663344 its reverse (44336617014512), we get a palindrome (65877688677856).

The spelling of 21541071663344 in words is "twenty-one trillion, five hundred forty-one billion, seventy-one million, six hundred sixty-three thousand, three hundred forty-four".