21142120093 has 2 divisors, whose sum is σ = 21142120094. Its totient is φ = 21142120092.

The previous prime is 21142120081. The next prime is 21142120117. The reversal of 21142120093 is 39002124112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18035952804 + 3106167289 = 134298^2 + 55733^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142120093 - 2⁵ = 21142120061 is a prime.

It is a super-3 number, since 3×21142120093³ (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 (21142120793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571060046 + 10571060047.

It is an arithmetic number, because the mean of its divisors is an integer number (10571060047).

Almost surely, 2^21142120093 is an apocalyptic number.

It is an amenable number.

21142120093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142120093 is an equidigital number, since it uses as much as digits as its factorization.

21142120093 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 21142120093 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty thousand, ninety-three".