21153505223 has 2 divisors, whose sum is σ = 21153505224. Its totient is φ = 21153505222.

The previous prime is 21153505199. The next prime is 21153505271. The reversal of 21153505223 is 32250535112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21153505223 - 2¹⁰ = 21153504199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21153505423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576752611 + 10576752612.

It is an arithmetic number, because the mean of its divisors is an integer number (10576752612).

Almost surely, 2^21153505223 is an apocalyptic number.

21153505223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153505223 is an equidigital number, since it uses as much as digits as its factorization.

21153505223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 21153505223 in words is "twenty-one billion, one hundred fifty-three million, five hundred five thousand, two hundred twenty-three".