21030680149 has 2 divisors, whose sum is σ = 21030680150. Its totient is φ = 21030680148.

The previous prime is 21030680057. The next prime is 21030680227. The reversal of 21030680149 is 94108603012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18956333124 + 2074347025 = 137682^2 + 45545^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030680149 - 2²³ = 21022291541 is a prime.

It is a super-4 number, since 4×21030680149⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030680249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515340074 + 10515340075.

It is an arithmetic number, because the mean of its divisors is an integer number (10515340075).

Almost surely, 2^21030680149 is an apocalyptic number.

It is an amenable number.

21030680149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030680149 is an equidigital number, since it uses as much as digits as its factorization.

21030680149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 21030680149 in words is "twenty-one billion, thirty million, six hundred eighty thousand, one hundred forty-nine".