211251220144 has 40 divisors (see below), whose sum is σ = 419468933520. Its totient is φ = 103003468800.

The previous prime is 211251220123. The next prime is 211251220181. The reversal of 211251220144 is 441022152112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1425747 + ... + 1566925.

It is an arithmetic number, because the mean of its divisors is an integer number (10486723338).

Almost surely, 2^211251220144 is an apocalyptic number.

It is an amenable number.

211251220144 is a deficient number, since it is larger than the sum of its proper divisors (208217713376).

211251220144 is a wasteful number, since it uses less digits than its factorization.

211251220144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143509 (or 143503 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 211251220144 its reverse (441022152112), we get a palindrome (652273372256).

The spelling of 211251220144 in words is "two hundred eleven billion, two hundred fifty-one million, two hundred twenty thousand, one hundred forty-four".