211221002020 has 48 divisors (see below), whose sum is σ = 511852094208. Its totient is φ = 71715530880.

The previous prime is 211221001993. The next prime is 211221002039. The reversal of 211221002020 is 20200122112.

It is a happy number.

It is a super-2 number, since 2×211221002020² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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, 7309471 + ... + 7338310.

It is an arithmetic number, because the mean of its divisors is an integer number (10663585296).

Almost surely, 2^211221002020 is an apocalyptic number.

211221002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221002020 is an abundant number, since it is smaller than the sum of its proper divisors (300631092188).

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

211221002020 is a wasteful number, since it uses less digits than its factorization.

211221002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14647900 (or 14647898 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 211221002020 its reverse (20200122112), we get a palindrome (231421124132).

The spelling of 211221002020 in words is "two hundred eleven billion, two hundred twenty-one million, two thousand, twenty".