21161005500122 has 8 divisors (see below), whose sum is σ = 31750107965472. Its totient is φ = 10577636178300.

The previous prime is 21161005500121. The next prime is 21161005500149. The reversal of 21161005500122 is 22100550016112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21161005500091 and 21161005500100.

It is not an unprimeable number, because it can be changed into a prime (21161005500121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1433276654 + ... + 1433291417.

It is an arithmetic number, because the mean of its divisors is an integer number (3968763495684).

Almost surely, 2^{21161005500122} is an apocalyptic number.

21161005500122 is a deficient number, since it is larger than the sum of its proper divisors (10589102465350).

21161005500122 is a wasteful number, since it uses less digits than its factorization.

21161005500122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866571764.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 21161005500122 its reverse (22100550016112), we get a palindrome (43261555516234).

The spelling of 21161005500122 in words is "twenty-one trillion, one hundred sixty-one billion, five million, five hundred thousand, one hundred twenty-two".