211451828261 has 16 divisors (see below), whose sum is σ = 216888845184. Its totient is φ = 206073027264.

The previous prime is 211451828257. The next prime is 211451828293. The reversal of 211451828261 is 162828154112.

It is a cyclic number.

It is not a de Polignac number, because 211451828261 - 2² = 211451828257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211451825261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4814975 + ... + 4858691.

It is an arithmetic number, because the mean of its divisors is an integer number (13555552824).

Almost surely, 2^211451828261 is an apocalyptic number.

It is an amenable number.

211451828261 is a deficient number, since it is larger than the sum of its proper divisors (5437016923).

211451828261 is a wasteful number, since it uses less digits than its factorization.

211451828261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44380.

The product of its digits is 61440, while the sum is 41.

The spelling of 211451828261 in words is "two hundred eleven billion, four hundred fifty-one million, eight hundred twenty-eight thousand, two hundred sixty-one".