21123301242153 has 64 divisors (see below), whose sum is σ = 32466195210240. Its totient is φ = 12096183859200.

The previous prime is 21123301242119. The next prime is 21123301242163. The reversal of 21123301242153 is 35124210332112.

It is not a de Polignac number, because 21123301242153 - 2⁸ = 21123301241897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21123301242153.

It is not an unprimeable number, because it can be changed into a prime (21123301242103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 113970883 + ... + 114156071.

It is an arithmetic number, because the mean of its divisors is an integer number (507284300160).

Almost surely, 2^{21123301242153} is an apocalyptic number.

It is an amenable number.

21123301242153 is a deficient number, since it is larger than the sum of its proper divisors (11342893968087).

21123301242153 is a wasteful number, since it uses less digits than its factorization.

21123301242153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187870.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21123301242153 its reverse (35124210332112), we get a palindrome (56247511574265).

The spelling of 21123301242153 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred one million, two hundred forty-two thousand, one hundred fifty-three".