212121220009969 has 2 divisors, whose sum is σ = 212121220009970. Its totient is φ = 212121220009968.

The previous prime is 212121220009943. The next prime is 212121220010017. The reversal of 212121220009969 is 969900022121212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173071468969569 + 39049751040400 = 13155663^2 + 6248980^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121220009969 - 2²¹ = 212121217912817 is a prime.

It is a super-2 number, since 2×212121220009969² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212121220009939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060610004984 + 106060610004985.

It is an arithmetic number, because the mean of its divisors is an integer number (106060610004985).

Almost surely, 2^{212121220009969} is an apocalyptic number.

It is an amenable number.

212121220009969 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121220009969 is an equidigital number, since it uses as much as digits as its factorization.

212121220009969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 212121220009969 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twenty million, nine thousand, nine hundred sixty-nine".