211821549660001 has 16 divisors (see below), whose sum is σ = 212446649664000. Its totient is φ = 211197649609600.

The previous prime is 211821549659987. The next prime is 211821549660089. The reversal of 211821549660001 is 100066945128112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211821549660001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211821549660901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1147065525 + ... + 1147250173.

It is an arithmetic number, because the mean of its divisors is an integer number (13277915604000).

Almost surely, 2^{211821549660001} is an apocalyptic number.

It is an amenable number.

211821549660001 is a deficient number, since it is larger than the sum of its proper divisors (625100003999).

211821549660001 is a wasteful number, since it uses less digits than its factorization.

211821549660001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187880.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 211821549660001 in words is "two hundred eleven trillion, eight hundred twenty-one billion, five hundred forty-nine million, six hundred sixty thousand, one".