21350644061356 has 24 divisors (see below), whose sum is σ = 38773958796720. Its totient is φ = 10274692610112.

The previous prime is 21350644061353. The next prime is 21350644061381. The reversal of 21350644061356 is 65316044605312.

It is not an unprimeable number, because it can be changed into a prime (21350644061353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290274390 + ... + 290347933.

It is an arithmetic number, because the mean of its divisors is an integer number (1615581616530).

Almost surely, 2^{21350644061356} is an apocalyptic number.

It is an amenable number.

21350644061356 is a deficient number, since it is larger than the sum of its proper divisors (17423314735364).

21350644061356 is a wasteful number, since it uses less digits than its factorization.

21350644061356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580622673 (or 580622671 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 46.

Adding to 21350644061356 its reverse (65316044605312), we get a palindrome (86666688666668).

The spelling of 21350644061356 in words is "twenty-one trillion, three hundred fifty billion, six hundred forty-four million, sixty-one thousand, three hundred fifty-six".