21202233001220 has 48 divisors (see below), whose sum is σ = 45055760122800. Its totient is φ = 8380326690816.

The previous prime is 21202233001193. The next prime is 21202233001237. The reversal of 21202233001220 is 2210033220212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7387273946116 + 13814959055104 = 2717954^2 + 3716848^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21202233001192 and 21202233001201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17857097 + ... + 19007376.

It is an arithmetic number, because the mean of its divisors is an integer number (938661669225).

Almost surely, 2^{21202233001220} is an apocalyptic number.

21202233001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202233001220 is an abundant number, since it is smaller than the sum of its proper divisors (23853527121580).

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

21202233001220 is a wasteful number, since it uses less digits than its factorization.

21202233001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36864824 (or 36864822 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21202233001220 its reverse (2210033220212), we get a palindrome (23412266221432).

The spelling of 21202233001220 in words is "twenty-one trillion, two hundred two billion, two hundred thirty-three million, one thousand, two hundred twenty".