20211101220 has 48 divisors (see below), whose sum is σ = 56907264960. Its totient is φ = 5359514496.

The previous prime is 20211101191. The next prime is 20211101221. The reversal of 20211101220 is 2210111202.

It is a super-2 number, since 2×20211101220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20211101196 and 20211101205.

It is not an unprimeable number, because it can be changed into a prime (20211101221) 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, 930187 + ... + 951666.

It is an arithmetic number, because the mean of its divisors is an integer number (1185568020).

Almost surely, 2^20211101220 is an apocalyptic number.

20211101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211101220 is an abundant number, since it is smaller than the sum of its proper divisors (36696163740).

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

20211101220 is a wasteful number, since it uses less digits than its factorization.

20211101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882044 (or 1882042 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20211101220 its reverse (2210111202), we get a palindrome (22421212422).

The spelling of 20211101220 in words is "twenty billion, two hundred eleven million, one hundred one thousand, two hundred twenty".