21220101111071 has 2 divisors, whose sum is σ = 21220101111072. Its totient is φ = 21220101111070.

The previous prime is 21220101111061. The next prime is 21220101111103. The reversal of 21220101111071 is 17011110102212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220101111071 - 2³⁰ = 21219027369247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220101111031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610050555535 + 10610050555536.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050555536).

Almost surely, 2^{21220101111071} is an apocalyptic number.

21220101111071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220101111071 is an equidigital number, since it uses as much as digits as its factorization.

21220101111071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 20.

Adding to 21220101111071 its reverse (17011110102212), we get a palindrome (38231211213283).

The spelling of 21220101111071 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred eleven thousand, seventy-one".