21011212093 has 2 divisors, whose sum is σ = 21011212094. Its totient is φ = 21011212092.

The previous prime is 21011212091. The next prime is 21011212121. The reversal of 21011212093 is 39021211012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12951122809 + 8060089284 = 113803^2 + 89778^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011212093 - 2¹ = 21011212091 is a prime.

Together with 21011212091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011212091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505606046 + 10505606047.

It is an arithmetic number, because the mean of its divisors is an integer number (10505606047).

Almost surely, 2^21011212093 is an apocalyptic number.

It is an amenable number.

21011212093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011212093 is an equidigital number, since it uses as much as digits as its factorization.

21011212093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21011212093 in words is "twenty-one billion, eleven million, two hundred twelve thousand, ninety-three".