212021999773 has 2 divisors, whose sum is σ = 212021999774. Its totient is φ = 212021999772.

The previous prime is 212021999747. The next prime is 212021999807. The reversal of 212021999773 is 377999120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124832902489 + 87189097284 = 353317^2 + 295278^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021999773 - 2¹³ = 212021991581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021999773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021999873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010999886 + 106010999887.

It is an arithmetic number, because the mean of its divisors is an integer number (106010999887).

Almost surely, 2^212021999773 is an apocalyptic number.

It is an amenable number.

212021999773 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021999773 is an equidigital number, since it uses as much as digits as its factorization.

212021999773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 52.

The spelling of 212021999773 in words is "two hundred twelve billion, twenty-one million, nine hundred ninety-nine thousand, seven hundred seventy-three".