21052555153 has 4 divisors (see below), whose sum is σ = 24060063040. Its totient is φ = 18045047268.

The previous prime is 21052555151. The next prime is 21052555159. The reversal of 21052555153 is 35155525012.

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 a cyclic number.

It is not a de Polignac number, because 21052555153 - 2¹ = 21052555151 is a prime.

It is a super-4 number, since 4×21052555153⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052555151) 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, 1503753933 + ... + 1503753946.

It is an arithmetic number, because the mean of its divisors is an integer number (6015015760).

Almost surely, 2^21052555153 is an apocalyptic number.

It is an amenable number.

21052555153 is a deficient number, since it is larger than the sum of its proper divisors (3007507887).

21052555153 is an equidigital number, since it uses as much as digits as its factorization.

21052555153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007507886.

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 21052555153 in words is "twenty-one billion, fifty-two million, five hundred fifty-five thousand, one hundred fifty-three".