21030329041949 has 2 divisors, whose sum is σ = 21030329041950. Its totient is φ = 21030329041948.

The previous prime is 21030329041867. The next prime is 21030329041979. The reversal of 21030329041949 is 94914092303012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16154314293049 + 4876014748900 = 4019243^2 + 2208170^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030329041949 - 2¹² = 21030329037853 is a prime.

It is a super-2 number, since 2×21030329041949² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030329041979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515164520974 + 10515164520975.

It is an arithmetic number, because the mean of its divisors is an integer number (10515164520975).

Almost surely, 2^{21030329041949} is an apocalyptic number.

It is an amenable number.

21030329041949 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030329041949 is an equidigital number, since it uses as much as digits as its factorization.

21030329041949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 21030329041949 in words is "twenty-one trillion, thirty billion, three hundred twenty-nine million, forty-one thousand, nine hundred forty-nine".