20211011993737 has 2 divisors, whose sum is σ = 20211011993738. Its totient is φ = 20211011993736.

The previous prime is 20211011993651. The next prime is 20211011993773. The reversal of 20211011993737 is 73739911011202.

Together with next prime (20211011993773) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20205528443136 + 5483550601 = 4495056^2 + 74051^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211011993737 - 2¹¹ = 20211011991689 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211011993797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105505996868 + 10105505996869.

It is an arithmetic number, because the mean of its divisors is an integer number (10105505996869).

Almost surely, 2^{20211011993737} is an apocalyptic number.

It is an amenable number.

20211011993737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211011993737 is an equidigital number, since it uses as much as digits as its factorization.

20211011993737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The spelling of 20211011993737 in words is "twenty trillion, two hundred eleven billion, eleven million, nine hundred ninety-three thousand, seven hundred thirty-seven".