21988075201 has 4 divisors (see below), whose sum is σ = 21988426372. Its totient is φ = 21987724032.

The previous prime is 21988075171. The next prime is 21988075231. The reversal of 21988075201 is 10257088912.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21988075171) and next prime (21988075231).

It can be written as a sum of positive squares in 2 ways, for example, as 19537330176 + 2450745025 = 139776^2 + 49505^2 .

It is a cyclic number.

It is not a de Polignac number, because 21988075201 - 2⁵ = 21988075169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21988075231) 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, 53256 + ... + 216361.

It is an arithmetic number, because the mean of its divisors is an integer number (5497106593).

Almost surely, 2^21988075201 is an apocalyptic number.

It is an amenable number.

21988075201 is a deficient number, since it is larger than the sum of its proper divisors (351171).

21988075201 is an equidigital number, since it uses as much as digits as its factorization.

21988075201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351170.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 21988075201 in words is "twenty-one billion, nine hundred eighty-eight million, seventy-five thousand, two hundred one".