21200011221012 has 48 divisors (see below), whose sum is σ = 53272300990272. Its totient is φ = 6523021854720.

The previous prime is 21200011220963. The next prime is 21200011221017. The reversal of 21200011221012 is 21012211000212.

It is a super-2 number, since 2×21200011221012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21200011220982 and 21200011221000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200011221017) 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, 18811587 + ... + 19906677.

It is an arithmetic number, because the mean of its divisors is an integer number (1109839603964).

Almost surely, 2^{21200011221012} is an apocalyptic number.

It is an amenable number.

21200011221012 is an abundant number, since it is smaller than the sum of its proper divisors (32072289769260).

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

21200011221012 is a wasteful number, since it uses less digits than its factorization.

21200011221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219208 (or 1219206 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200011221012 its reverse (21012211000212), we get a palindrome (42212222221224).

The spelling of 21200011221012 in words is "twenty-one trillion, two hundred billion, eleven million, two hundred twenty-one thousand, twelve".