212188353108421 has 2 divisors, whose sum is σ = 212188353108422. Its totient is φ = 212188353108420.

The previous prime is 212188353108287. The next prime is 212188353108443. The reversal of 212188353108421 is 124801353881212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210142394771521 + 2045958336900 = 14496289^2 + 1430370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212188353108421 is a prime.

It is a super-2 number, since 2×212188353108421² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212188353106421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106094176554210 + 106094176554211.

It is an arithmetic number, because the mean of its divisors is an integer number (106094176554211).

Almost surely, 2^{212188353108421} is an apocalyptic number.

It is an amenable number.

212188353108421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212188353108421 is an equidigital number, since it uses as much as digits as its factorization.

212188353108421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 212188353108421 in words is "two hundred twelve trillion, one hundred eighty-eight billion, three hundred fifty-three million, one hundred eight thousand, four hundred twenty-one".