21611130773201 has 4 divisors (see below), whose sum is σ = 21614829415152. Its totient is φ = 21607432131252.

The previous prime is 21611130773123. The next prime is 21611130773213. The reversal of 21611130773201 is 10237703111612.

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 a de Polignac number, because none of the positive numbers 2^k-21611130773201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21611130773801) 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, 1849312211 + ... + 1849323896.

It is an arithmetic number, because the mean of its divisors is an integer number (5403707353788).

Almost surely, 2^{21611130773201} is an apocalyptic number.

It is an amenable number.

21611130773201 is a deficient number, since it is larger than the sum of its proper divisors (3698641951).

21611130773201 is an equidigital number, since it uses as much as digits as its factorization.

21611130773201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3698641950.

The product of its (nonzero) digits is 10584, while the sum is 35.

Adding to 21611130773201 its reverse (10237703111612), we get a palindrome (31848833884813).

The spelling of 21611130773201 in words is "twenty-one trillion, six hundred eleven billion, one hundred thirty million, seven hundred seventy-three thousand, two hundred one".