21000100021193 has 2 divisors, whose sum is σ = 21000100021194. Its totient is φ = 21000100021192.

The previous prime is 21000100021169. The next prime is 21000100021333. The reversal of 21000100021193 is 39112000100012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20997180023824 + 2919997369 = 4582268^2 + 54037^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000100021193 - 2⁶ = 21000100021129 is a prime.

It is a super-2 number, since 2×21000100021193² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21000100021093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500050010596 + 10500050010597.

It is an arithmetic number, because the mean of its divisors is an integer number (10500050010597).

Almost surely, 2^{21000100021193} is an apocalyptic number.

It is an amenable number.

21000100021193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000100021193 is an equidigital number, since it uses as much as digits as its factorization.

21000100021193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21000100021193 in words is "twenty-one trillion, one hundred million, twenty-one thousand, one hundred ninety-three".