211444220001 has 32 divisors (see below), whose sum is σ = 328967654400. Its totient is φ = 118303992000.

The previous prime is 211444219993. The next prime is 211444220003. The reversal of 211444220001 is 100022444112.

It is not a de Polignac number, because 211444220001 - 2³ = 211444219993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 211444220001.

It is not an unprimeable number, because it can be changed into a prime (211444220003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28966 + ... + 650943.

It is an arithmetic number, because the mean of its divisors is an integer number (10280239200).

Almost surely, 2^211444220001 is an apocalyptic number.

211444220001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211444220001 is a deficient number, since it is larger than the sum of its proper divisors (117523434399).

211444220001 is a wasteful number, since it uses less digits than its factorization.

211444220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680229.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 211444220001 its reverse (100022444112), we get a palindrome (311466664113).

The spelling of 211444220001 in words is "two hundred eleven billion, four hundred forty-four million, two hundred twenty thousand, one".