20211000221220 has 48 divisors (see below), whose sum is σ = 57003872179968. Its totient is φ = 5350259910400.

The previous prime is 20211000221213. The next prime is 20211000221267. The reversal of 20211000221220 is 2212200011202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20211000221220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1229371356 + ... + 1229387795.

It is an arithmetic number, because the mean of its divisors is an integer number (1187580670416).

Almost surely, 2^{20211000221220} is an apocalyptic number.

20211000221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211000221220 is an abundant number, since it is smaller than the sum of its proper divisors (36792871958748).

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

20211000221220 is a wasteful number, since it uses less digits than its factorization.

20211000221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458759300 (or 2458759298 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20211000221220 its reverse (2212200011202), we get a palindrome (22423200232422).

The spelling of 20211000221220 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one thousand, two hundred twenty".