21030680029 has 2 divisors, whose sum is σ = 21030680030. Its totient is φ = 21030680028.

The previous prime is 21030679979. The next prime is 21030680057. The reversal of 21030680029 is 92008603012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19320444004 + 1710236025 = 138998^2 + 41355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030680029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030680329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515340014 + 10515340015.

It is an arithmetic number, because the mean of its divisors is an integer number (10515340015).

Almost surely, 2^21030680029 is an apocalyptic number.

It is an amenable number.

21030680029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030680029 is an equidigital number, since it uses as much as digits as its factorization.

21030680029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 21030680029 in words is "twenty-one billion, thirty million, six hundred eighty thousand, twenty-nine".