21754211220071 has 4 divisors (see below), whose sum is σ = 23731866785544. Its totient is φ = 19776555654600.

The previous prime is 21754211220067. The next prime is 21754211220121. The reversal of 21754211220071 is 17002211245712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21754211220071 - 2² = 21754211220067 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21754211220671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988827782720 + ... + 988827782741.

It is an arithmetic number, because the mean of its divisors is an integer number (5932966696386).

Almost surely, 2^{21754211220071} is an apocalyptic number.

21754211220071 is a deficient number, since it is larger than the sum of its proper divisors (1977655565473).

21754211220071 is a wasteful number, since it uses less digits than its factorization.

21754211220071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977655565472.

The product of its (nonzero) digits is 15680, while the sum is 35.

Adding to 21754211220071 its reverse (17002211245712), we get a palindrome (38756422465783).

The spelling of 21754211220071 in words is "twenty-one trillion, seven hundred fifty-four billion, two hundred eleven million, two hundred twenty thousand, seventy-one".