10212121109977 has 2 divisors, whose sum is σ = 10212121109978. Its totient is φ = 10212121109976.

The previous prime is 10212121109969. The next prime is 10212121110043. The reversal of 10212121109977 is 77990112121201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10083190563216 + 128930546761 = 3175404^2 + 359069^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212121109977 - 2³ = 10212121109969 is a prime.

It is not a weakly prime, because it can be changed into another prime (10212121109947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106060554988 + 5106060554989.

It is an arithmetic number, because the mean of its divisors is an integer number (5106060554989).

Almost surely, 2^{10212121109977} is an apocalyptic number.

It is an amenable number.

10212121109977 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212121109977 is an equidigital number, since it uses as much as digits as its factorization.

10212121109977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 43.

The spelling of 10212121109977 in words is "ten trillion, two hundred twelve billion, one hundred twenty-one million, one hundred nine thousand, nine hundred seventy-seven".