211220220044 has 48 divisors (see below), whose sum is σ = 398950755840. Its totient is φ = 97597484160.

The previous prime is 211220220023. The next prime is 211220220049. The reversal of 211220220044 is 440022022112.

It is a super-2 number, since 2×211220220044² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220219998 and 211220220025.

It is not an unprimeable number, because it can be changed into a prime (211220220049) 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, 116687 + ... + 660345.

It is an arithmetic number, because the mean of its divisors is an integer number (8311474080).

Almost surely, 2^211220220044 is an apocalyptic number.

It is an amenable number.

211220220044 is a deficient number, since it is larger than the sum of its proper divisors (187730535796).

211220220044 is a wasteful number, since it uses less digits than its factorization.

211220220044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543830 (or 543828 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 211220220044 its reverse (440022022112), we get a palindrome (651242242156).

The spelling of 211220220044 in words is "two hundred eleven billion, two hundred twenty million, two hundred twenty thousand, forty-four".