21271722072730 has 16 divisors (see below), whose sum is σ = 38365221210624. Its totient is φ = 8491772944720.

The previous prime is 21271722072673. The next prime is 21271722072763. The reversal of 21271722072730 is 3727022717212.

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, 2114480266 + ... + 2114490325.

It is an arithmetic number, because the mean of its divisors is an integer number (2397826325664).

Almost surely, 2^{21271722072730} is an apocalyptic number.

21271722072730 is a deficient number, since it is larger than the sum of its proper divisors (17093499137894).

21271722072730 is a wasteful number, since it uses less digits than its factorization.

21271722072730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228971101.

The product of its (nonzero) digits is 230496, while the sum is 43.

Adding to 21271722072730 its reverse (3727022717212), we get a palindrome (24998744789942).

The spelling of 21271722072730 in words is "twenty-one trillion, two hundred seventy-one billion, seven hundred twenty-two million, seventy-two thousand, seven hundred thirty".