21212020201122 has 48 divisors (see below), whose sum is σ = 46063745874432. Its totient is φ = 7054628724960.

The previous prime is 21212020201121. The next prime is 21212020201147. The reversal of 21212020201122 is 22110202021212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21212020201095 and 21212020201104.

It is not an unprimeable number, because it can be changed into a prime (21212020201121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20663773 + ... + 21665999.

It is an arithmetic number, because the mean of its divisors is an integer number (959661372384).

Almost surely, 2^{21212020201122} is an apocalyptic number.

21212020201122 is an abundant number, since it is smaller than the sum of its proper divisors (24851725673310).

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

21212020201122 is a wasteful number, since it uses less digits than its factorization.

21212020201122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004903 (or 1004900 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21212020201122 its reverse (22110202021212), we get a palindrome (43322222222334).

The spelling of 21212020201122 in words is "twenty-one trillion, two hundred twelve billion, twenty million, two hundred one thousand, one hundred twenty-two".