211098961921 has 16 divisors (see below), whose sum is σ = 221513846400. Its totient is φ = 200904334848.

The previous prime is 211098961919. The next prime is 211098961973. The reversal of 211098961921 is 129169890112.

It is a cyclic number.

It is not a de Polignac number, because 211098961921 - 2¹ = 211098961919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211098161921) 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, 956785 + ... + 1156561.

It is an arithmetic number, because the mean of its divisors is an integer number (13844615400).

Almost surely, 2^211098961921 is an apocalyptic number.

It is an amenable number.

211098961921 is a deficient number, since it is larger than the sum of its proper divisors (10414884479).

211098961921 is a wasteful number, since it uses less digits than its factorization.

211098961921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200328.

The product of its (nonzero) digits is 139968, while the sum is 49.

The spelling of 211098961921 in words is "two hundred eleven billion, ninety-eight million, nine hundred sixty-one thousand, nine hundred twenty-one".