211221120022220 has 48 divisors (see below), whose sum is σ = 553015296062208. Its totient is φ = 65835154292160.

The previous prime is 211221120022177. The next prime is 211221120022223. The reversal of 211221120022220 is 22220021122112.

It is a super-2 number, since 2×211221120022220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 211221120022192 and 211221120022201.

It is not an unprimeable number, because it can be changed into a prime (211221120022223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68578284182 + ... + 68578287261.

It is an arithmetic number, because the mean of its divisors is an integer number (11521152001296).

Almost surely, 2^{211221120022220} is an apocalyptic number.

211221120022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221120022220 is an abundant number, since it is smaller than the sum of its proper divisors (341794176039988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221120022220 is a wasteful number, since it uses less digits than its factorization.

211221120022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137156571470 (or 137156571468 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 211221120022220 its reverse (22220021122112), we get a palindrome (233441141144332).

The spelling of 211221120022220 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty million, twenty-two thousand, two hundred twenty".