212902102781 has 2 divisors, whose sum is σ = 212902102782. Its totient is φ = 212902102780.

The previous prime is 212902102769. The next prime is 212902102811. The reversal of 212902102781 is 187201209212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119947239556 + 92954863225 = 346334^2 + 304885^2 .

It is a cyclic number.

It is not a de Polignac number, because 212902102781 - 2¹⁰ = 212902101757 is a prime.

It is a super-2 number, since 2×212902102781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212902102481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106451051390 + 106451051391.

It is an arithmetic number, because the mean of its divisors is an integer number (106451051391).

Almost surely, 2^212902102781 is an apocalyptic number.

It is an amenable number.

212902102781 is a deficient number, since it is larger than the sum of its proper divisors (1).

212902102781 is an equidigital number, since it uses as much as digits as its factorization.

212902102781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 212902102781 in words is "two hundred twelve billion, nine hundred two million, one hundred two thousand, seven hundred eighty-one".