21706016022211 has 4 divisors (see below), whose sum is σ = 21862174411000. Its totient is φ = 21549857633424.

The previous prime is 21706016022137. The next prime is 21706016022221. The reversal of 21706016022211 is 11222061060712.

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 21706016022211 - 2¹⁹ = 21706015497923 is a prime.

It is a super-3 number, since 3×21706016022211³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21706016022221) 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, 78079194186 + ... + 78079194463.

It is an arithmetic number, because the mean of its divisors is an integer number (5465543602750).

Almost surely, 2^{21706016022211} is an apocalyptic number.

21706016022211 is a deficient number, since it is larger than the sum of its proper divisors (156158388789).

21706016022211 is a wasteful number, since it uses less digits than its factorization.

21706016022211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156158388788.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 21706016022211 its reverse (11222061060712), we get a palindrome (32928077082923).

The spelling of 21706016022211 in words is "twenty-one trillion, seven hundred six billion, sixteen million, twenty-two thousand, two hundred eleven".