21240142093 has 2 divisors, whose sum is σ = 21240142094. Its totient is φ = 21240142092.

The previous prime is 21240142087. The next prime is 21240142103. The reversal of 21240142093 is 39024104212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20051409609 + 1188732484 = 141603^2 + 34478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21240142093 is a prime.

It is a super-2 number, since 2×21240142093² (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 (21240148093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620071046 + 10620071047.

It is an arithmetic number, because the mean of its divisors is an integer number (10620071047).

Almost surely, 2^21240142093 is an apocalyptic number.

It is an amenable number.

21240142093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240142093 is an equidigital number, since it uses as much as digits as its factorization.

21240142093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21240142093 in words is "twenty-one billion, two hundred forty million, one hundred forty-two thousand, ninety-three".