21110022009997 has 2 divisors, whose sum is σ = 21110022009998. Its totient is φ = 21110022009996.

The previous prime is 21110022009961. The next prime is 21110022010061. The reversal of 21110022009997 is 79990022001112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15149485510756 + 5960536499241 = 3892234^2 + 2441421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110022009997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110022009917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555011004998 + 10555011004999.

It is an arithmetic number, because the mean of its divisors is an integer number (10555011004999).

Almost surely, 2^{21110022009997} is an apocalyptic number.

It is an amenable number.

21110022009997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110022009997 is an equidigital number, since it uses as much as digits as its factorization.

21110022009997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 21110022009997 in words is "twenty-one trillion, one hundred ten billion, twenty-two million, nine thousand, nine hundred ninety-seven".