21231200771670 has 16 divisors (see below), whose sum is σ = 50954881852080. Its totient is φ = 5661653539104.

The previous prime is 21231200771647. The next prime is 21231200771681. The reversal of 21231200771670 is 7617700213212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353853346165 + ... + 353853346224.

It is an arithmetic number, because the mean of its divisors is an integer number (3184680115755).

Almost surely, 2^{21231200771670} is an apocalyptic number.

21231200771670 is an abundant number, since it is smaller than the sum of its proper divisors (29723681080410).

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

21231200771670 is a wasteful number, since it uses less digits than its factorization.

21231200771670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707706692399.

The product of its (nonzero) digits is 49392, while the sum is 39.

Adding to 21231200771670 its reverse (7617700213212), we get a palindrome (28848900984882).

The spelling of 21231200771670 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred million, seven hundred seventy-one thousand, six hundred seventy".