212012001999689 has 2 divisors, whose sum is σ = 212012001999690. Its totient is φ = 212012001999688.

The previous prime is 212012001999617. The next prime is 212012001999767. The reversal of 212012001999689 is 986999100210212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171202046736400 + 40809955263289 = 13084420^2 + 6388267^2 .

It is a cyclic number.

It is not a de Polignac number, because 212012001999689 - 2⁸ = 212012001999433 is a prime.

It is a super-2 number, since 2×212012001999689² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212012001999289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006000999844 + 106006000999845.

It is an arithmetic number, because the mean of its divisors is an integer number (106006000999845).

Almost surely, 2^{212012001999689} is an apocalyptic number.

It is an amenable number.

212012001999689 is a deficient number, since it is larger than the sum of its proper divisors (1).

212012001999689 is an equidigital number, since it uses as much as digits as its factorization.

212012001999689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 59.

The spelling of 212012001999689 in words is "two hundred twelve trillion, twelve billion, one million, nine hundred ninety-nine thousand, six hundred eighty-nine".