21001132049 has 2 divisors, whose sum is σ = 21001132050. Its totient is φ = 21001132048.

The previous prime is 21001132039. The next prime is 21001132157. The reversal of 21001132049 is 94023110012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16891681024 + 4109451025 = 129968^2 + 64105^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001132049 - 2²⁰ = 21000083473 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001132039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500566024 + 10500566025.

It is an arithmetic number, because the mean of its divisors is an integer number (10500566025).

Almost surely, 2^21001132049 is an apocalyptic number.

It is an amenable number.

21001132049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001132049 is an equidigital number, since it uses as much as digits as its factorization.

21001132049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21001132049 in words is "twenty-one billion, one million, one hundred thirty-two thousand, forty-nine".