210124221949 has 2 divisors, whose sum is σ = 210124221950. Its totient is φ = 210124221948.

The previous prime is 210124221947. The next prime is 210124222013. The reversal of 210124221949 is 949122421012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209839118724 + 285103225 = 458082^2 + 16885^2 .

It is a cyclic number.

It is not a de Polignac number, because 210124221949 - 2¹ = 210124221947 is a prime.

It is a super-2 number, since 2×210124221949² (a number of 23 digits) contains 22 as substring.

Together with 210124221947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210124221947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105062110974 + 105062110975.

It is an arithmetic number, because the mean of its divisors is an integer number (105062110975).

Almost surely, 2^210124221949 is an apocalyptic number.

It is an amenable number.

210124221949 is a deficient number, since it is larger than the sum of its proper divisors (1).

210124221949 is an equidigital number, since it uses as much as digits as its factorization.

210124221949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 210124221949 in words is "two hundred ten billion, one hundred twenty-four million, two hundred twenty-one thousand, nine hundred forty-nine".