21121111220093 has 2 divisors, whose sum is σ = 21121111220094. Its totient is φ = 21121111220092.

The previous prime is 21121111219979. The next prime is 21121111220147. The reversal of 21121111220093 is 39002211112112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18893740036249 + 2227371183844 = 4346693^2 + 1492438^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121111220093 - 2¹⁸ = 21121110957949 is a prime.

It is a super-2 number, since 2×21121111220093² (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 (21121111229093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560555610046 + 10560555610047.

It is an arithmetic number, because the mean of its divisors is an integer number (10560555610047).

Almost surely, 2^{21121111220093} is an apocalyptic number.

It is an amenable number.

21121111220093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121111220093 is an equidigital number, since it uses as much as digits as its factorization.

21121111220093 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 26.

The spelling of 21121111220093 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, ninety-three".