21212211001120 has 24 divisors (see below), whose sum is σ = 50113848490524. Its totient is φ = 8484884400384.

The previous prime is 21212211001063. The next prime is 21212211001123. The reversal of 21212211001120 is 2110011221212.

It can be written as a sum of positive squares in 2 ways, for example, as 20497097226384 + 715113774736 = 4527372^2 + 845644^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21212211001094 and 21212211001103.

It is not an unprimeable number, because it can be changed into a prime (21212211001123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66288159219 + ... + 66288159538.

Almost surely, 2^{21212211001120} is an apocalyptic number.

21212211001120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212211001120 is an abundant number, since it is smaller than the sum of its proper divisors (28901637489404).

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

21212211001120 is a wasteful number, since it uses less digits than its factorization.

21212211001120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132576318772 (or 132576318764 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21212211001120 its reverse (2110011221212), we get a palindrome (23322222222332).

The spelling of 21212211001120 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, one thousand, one hundred twenty".