21153050145 has 12 divisors (see below), whose sum is σ = 36665286996. Its totient is φ = 11281626720.

The previous prime is 21153050143. The next prime is 21153050153. The reversal of 21153050145 is 54105035112.

21153050145 is a `hidden beast` number, since 2 + 1 + 153 + 0 + 501 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16253190144 + 4899860001 = 127488^2 + 69999^2 .

It is not a de Polignac number, because 21153050145 - 2¹ = 21153050143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21153050143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235033846 + ... + 235033935.

It is an arithmetic number, because the mean of its divisors is an integer number (3055440583).

Almost surely, 2^21153050145 is an apocalyptic number.

It is an amenable number.

21153050145 is a deficient number, since it is larger than the sum of its proper divisors (15512236851).

21153050145 is a wasteful number, since it uses less digits than its factorization.

21153050145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470067792 (or 470067789 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 21153050145 its reverse (54105035112), we get a palindrome (75258085257).

The spelling of 21153050145 in words is "twenty-one billion, one hundred fifty-three million, fifty thousand, one hundred forty-five".