212221199979947 has 2 divisors, whose sum is σ = 212221199979948. Its totient is φ = 212221199979946.

The previous prime is 212221199979941. The next prime is 212221199979959. The reversal of 212221199979947 is 749979991122212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212221199979947 - 2¹⁰ = 212221199978923 is a prime.

It is a super-3 number, since 3×212221199979947³ (a number of 44 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (212221199979941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110599989973 + 106110599989974.

It is an arithmetic number, because the mean of its divisors is an integer number (106110599989974).

Almost surely, 2^{212221199979947} is an apocalyptic number.

212221199979947 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221199979947 is an equidigital number, since it uses as much as digits as its factorization.

212221199979947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185177664, while the sum is 74.

The spelling of 212221199979947 in words is "two hundred twelve trillion, two hundred twenty-one billion, one hundred ninety-nine million, nine hundred seventy-nine thousand, nine hundred forty-seven".