21421120093 has 2 divisors, whose sum is σ = 21421120094. Its totient is φ = 21421120092.

The previous prime is 21421120057. The next prime is 21421120153. The reversal of 21421120093 is 39002112412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17078046489 + 4343073604 = 130683^2 + 65902^2 .

It is a cyclic number.

It is not a de Polignac number, because 21421120093 - 2⁹ = 21421119581 is a prime.

It is a super-3 number, since 3×21421120093³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21421180093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710560046 + 10710560047.

It is an arithmetic number, because the mean of its divisors is an integer number (10710560047).

Almost surely, 2^21421120093 is an apocalyptic number.

It is an amenable number.

21421120093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421120093 is an equidigital number, since it uses as much as digits as its factorization.

21421120093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21421120093 in words is "twenty-one billion, four hundred twenty-one million, one hundred twenty thousand, ninety-three".