21021111101093 has 2 divisors, whose sum is σ = 21021111101094. Its totient is φ = 21021111101092.

The previous prime is 21021111101087. The next prime is 21021111101203. The reversal of 21021111101093 is 39010111112012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18765686835844 + 2255424265249 = 4331938^2 + 1501807^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021111101093 - 2¹⁴ = 21021111084709 is a prime.

It is a super-2 number, since 2×21021111101093² (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 (21021111101033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510555550546 + 10510555550547.

It is an arithmetic number, because the mean of its divisors is an integer number (10510555550547).

Almost surely, 2^{21021111101093} is an apocalyptic number.

It is an amenable number.

21021111101093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021111101093 is an equidigital number, since it uses as much as digits as its factorization.

21021111101093 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 23.

The spelling of 21021111101093 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, one hundred one thousand, ninety-three".