20121797893 has 2 divisors, whose sum is σ = 20121797894. Its totient is φ = 20121797892.

The previous prime is 20121797887. The next prime is 20121797903. The reversal of 20121797893 is 39879712102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20045462724 + 76335169 = 141582^2 + 8737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121797893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121797833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060898946 + 10060898947.

It is an arithmetic number, because the mean of its divisors is an integer number (10060898947).

Almost surely, 2^20121797893 is an apocalyptic number.

It is an amenable number.

20121797893 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121797893 is an equidigital number, since it uses as much as digits as its factorization.

20121797893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 49.

The spelling of 20121797893 in words is "twenty billion, one hundred twenty-one million, seven hundred ninety-seven thousand, eight hundred ninety-three".