211142808644 has 12 divisors (see below), whose sum is σ = 370474851600. Its totient is φ = 105292851048.

The previous prime is 211142808637. The next prime is 211142808647. The reversal of 211142808644 is 446808241112.

It is a super-2 number, since 2×211142808644² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211142808647) 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, 69636614 + ... + 69639645.

It is an arithmetic number, because the mean of its divisors is an integer number (30872904300).

Almost surely, 2^211142808644 is an apocalyptic number.

It is an amenable number.

211142808644 is a deficient number, since it is larger than the sum of its proper divisors (159332042956).

211142808644 is a wasteful number, since it uses less digits than its factorization.

211142808644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139276642 (or 139276640 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 41.

The spelling of 211142808644 in words is "two hundred eleven billion, one hundred forty-two million, eight hundred eight thousand, six hundred forty-four".