212994891881 has 2 divisors, whose sum is σ = 212994891882. Its totient is φ = 212994891880.

The previous prime is 212994891841. The next prime is 212994891887. The reversal of 212994891881 is 188198499212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208019000281 + 4975891600 = 456091^2 + 70540^2 .

It is a cyclic number.

It is not a de Polignac number, because 212994891881 - 2¹⁴ = 212994875497 is a prime.

It is a super-2 number, since 2×212994891881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212994891887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106497445940 + 106497445941.

It is an arithmetic number, because the mean of its divisors is an integer number (106497445941).

Almost surely, 2^212994891881 is an apocalyptic number.

It is an amenable number.

212994891881 is a deficient number, since it is larger than the sum of its proper divisors (1).

212994891881 is an equidigital number, since it uses as much as digits as its factorization.

212994891881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 62.

The spelling of 212994891881 in words is "two hundred twelve billion, nine hundred ninety-four million, eight hundred ninety-one thousand, eight hundred eighty-one".