21101199893 has 2 divisors, whose sum is σ = 21101199894. Its totient is φ = 21101199892.

The previous prime is 21101199887. The next prime is 21101199919. The reversal of 21101199893 is 39899110112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12990756529 + 8110443364 = 113977^2 + 90058^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101199893 - 2⁶ = 21101199829 is a prime.

It is a super-2 number, since 2×21101199893² (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 (21101199803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550599946 + 10550599947.

It is an arithmetic number, because the mean of its divisors is an integer number (10550599947).

Almost surely, 2^21101199893 is an apocalyptic number.

It is an amenable number.

21101199893 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101199893 is an equidigital number, since it uses as much as digits as its factorization.

21101199893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 44.

The spelling of 21101199893 in words is "twenty-one billion, one hundred one million, one hundred ninety-nine thousand, eight hundred ninety-three".