21120210149 has 2 divisors, whose sum is σ = 21120210150. Its totient is φ = 21120210148.

The previous prime is 21120210119. The next prime is 21120210191. The reversal of 21120210149 is 94101202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21041533249 + 78676900 = 145057^2 + 8870^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120210149 - 2¹² = 21120206053 is a prime.

It is a super-3 number, since 3×21120210149³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120210119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560105074 + 10560105075.

It is an arithmetic number, because the mean of its divisors is an integer number (10560105075).

Almost surely, 2^21120210149 is an apocalyptic number.

It is an amenable number.

21120210149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120210149 is an equidigital number, since it uses as much as digits as its factorization.

21120210149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21120210149 in words is "twenty-one billion, one hundred twenty million, two hundred ten thousand, one hundred forty-nine".