20535021149 has 2 divisors, whose sum is σ = 20535021150. Its totient is φ = 20535021148.

The previous prime is 20535021113. The next prime is 20535021167. The reversal of 20535021149 is 94112053502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10623424900 + 9911596249 = 103070^2 + 99557^2 .

It is a cyclic number.

It is not a de Polignac number, because 20535021149 - 2²⁰ = 20533972573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20535021109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267510574 + 10267510575.

It is an arithmetic number, because the mean of its divisors is an integer number (10267510575).

Almost surely, 2^20535021149 is an apocalyptic number.

It is an amenable number.

20535021149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20535021149 is an equidigital number, since it uses as much as digits as its factorization.

20535021149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 20535021149 in words is "twenty billion, five hundred thirty-five million, twenty-one thousand, one hundred forty-nine".