21386121170 has 32 divisors (see below), whose sum is σ = 39303714240. Its totient is φ = 8375896000.

The previous prime is 21386121167. The next prime is 21386121191. The reversal of 21386121170 is 7112168312.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75884 + ... + 220296.

It is an arithmetic number, because the mean of its divisors is an integer number (1228241070).

Almost surely, 2^21386121170 is an apocalyptic number.

21386121170 is a deficient number, since it is larger than the sum of its proper divisors (17917593070).

21386121170 is a wasteful number, since it uses less digits than its factorization.

21386121170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144730.

The product of its (nonzero) digits is 4032, while the sum is 32.

Adding to 21386121170 its reverse (7112168312), we get a palindrome (28498289482).

The spelling of 21386121170 in words is "twenty-one billion, three hundred eighty-six million, one hundred twenty-one thousand, one hundred seventy".