21121210200020 has 48 divisors (see below), whose sum is σ = 50821215419520. Its totient is φ = 7222941934464.

The previous prime is 21121210200017. The next prime is 21121210200029. The reversal of 21121210200020 is 2000201212112.

It is a super-2 number, since 2×21121210200020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21121210199968 and 21121210200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121210200029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193860434 + ... + 193969353.

It is an arithmetic number, because the mean of its divisors is an integer number (1058775321240).

Almost surely, 2^{21121210200020} is an apocalyptic number.

21121210200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121210200020 is an abundant number, since it is smaller than the sum of its proper divisors (29700005219500).

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

21121210200020 is a wasteful number, since it uses less digits than its factorization.

21121210200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387830192 (or 387830190 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21121210200020 its reverse (2000201212112), we get a palindrome (23121411412132).

The spelling of 21121210200020 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, two hundred thousand, twenty".