21153122303 has 4 divisors (see below), whose sum is σ = 21259419600. Its totient is φ = 21046825008.

The previous prime is 21153122297. The next prime is 21153122329. The reversal of 21153122303 is 30322135112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21153122303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153122383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53148350 + ... + 53148747.

It is an arithmetic number, because the mean of its divisors is an integer number (5314854900).

Almost surely, 2^21153122303 is an apocalyptic number.

21153122303 is a deficient number, since it is larger than the sum of its proper divisors (106297297).

21153122303 is a wasteful number, since it uses less digits than its factorization.

21153122303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106297296.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21153122303 its reverse (30322135112), we get a palindrome (51475257415).

The spelling of 21153122303 in words is "twenty-one billion, one hundred fifty-three million, one hundred twenty-two thousand, three hundred three".