21210051153 has 4 divisors (see below), whose sum is σ = 28280068208. Its totient is φ = 14140034100.

The previous prime is 21210051133. The next prime is 21210051209. The reversal of 21210051153 is 35115001212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21210051153 - 2⁶ = 21210051089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210051113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535008523 + ... + 3535008528.

It is an arithmetic number, because the mean of its divisors is an integer number (7070017052).

Almost surely, 2^21210051153 is an apocalyptic number.

It is an amenable number.

21210051153 is a deficient number, since it is larger than the sum of its proper divisors (7070017055).

21210051153 is an equidigital number, since it uses as much as digits as its factorization.

21210051153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7070017054.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 21210051153 its reverse (35115001212), we get a palindrome (56325052365).

The spelling of 21210051153 in words is "twenty-one billion, two hundred ten million, fifty-one thousand, one hundred fifty-three".