21533500193111 has 2 divisors, whose sum is σ = 21533500193112. Its totient is φ = 21533500193110.

The previous prime is 21533500193089. The next prime is 21533500193131. The reversal of 21533500193111 is 11139100533512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21533500193111 - 2⁴² = 17135453682007 is a prime.

It is a super-2 number, since 2×21533500193111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21533500193131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766750096555 + 10766750096556.

It is an arithmetic number, because the mean of its divisors is an integer number (10766750096556).

Almost surely, 2^{21533500193111} is an apocalyptic number.

21533500193111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21533500193111 is an equidigital number, since it uses as much as digits as its factorization.

21533500193111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 35.

The spelling of 21533500193111 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred million, one hundred ninety-three thousand, one hundred eleven".