21652155201 has 4 divisors (see below), whose sum is σ = 28869540272. Its totient is φ = 14434770132.

The previous prime is 21652155181. The next prime is 21652155211. The reversal of 21652155201 is 10255125612.

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 21652155201 - 2¹¹ = 21652153153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21652155211) 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, 3608692531 + ... + 3608692536.

It is an arithmetic number, because the mean of its divisors is an integer number (7217385068).

Almost surely, 2^21652155201 is an apocalyptic number.

It is an amenable number.

21652155201 is a deficient number, since it is larger than the sum of its proper divisors (7217385071).

21652155201 is an equidigital number, since it uses as much as digits as its factorization.

21652155201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7217385070.

The product of its (nonzero) digits is 6000, while the sum is 30.

The spelling of 21652155201 in words is "twenty-one billion, six hundred fifty-two million, one hundred fifty-five thousand, two hundred one".