21100220069 has 2 divisors, whose sum is σ = 21100220070. Its totient is φ = 21100220068.

The previous prime is 21100220051. The next prime is 21100220101. The reversal of 21100220069 is 96002200112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19273768900 + 1826451169 = 138830^2 + 42737^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100220069 - 2⁸ = 21100219813 is a prime.

It is a super-2 number, since 2×21100220069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100220369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550110034 + 10550110035.

It is an arithmetic number, because the mean of its divisors is an integer number (10550110035).

Almost surely, 2^21100220069 is an apocalyptic number.

It is an amenable number.

21100220069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100220069 is an equidigital number, since it uses as much as digits as its factorization.

21100220069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21100220069 in words is "twenty-one billion, one hundred million, two hundred twenty thousand, sixty-nine".