21537030049 has 2 divisors, whose sum is σ = 21537030050. Its totient is φ = 21537030048.

The previous prime is 21537030001. The next prime is 21537030077. The reversal of 21537030049 is 94003073512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19158712225 + 2378317824 = 138415^2 + 48768^2 .

It is a cyclic number.

It is not a de Polignac number, because 21537030049 - 2³³ = 12947095457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21537029996 and 21537030023.

It is not a weakly prime, because it can be changed into another prime (21537030149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768515024 + 10768515025.

It is an arithmetic number, because the mean of its divisors is an integer number (10768515025).

Almost surely, 2^21537030049 is an apocalyptic number.

It is an amenable number.

21537030049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21537030049 is an equidigital number, since it uses as much as digits as its factorization.

21537030049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The spelling of 21537030049 in words is "twenty-one billion, five hundred thirty-seven million, thirty thousand, forty-nine".