21200011111012 has 24 divisors (see below), whose sum is σ = 38006291705760. Its totient is φ = 10341089586240.

The previous prime is 21200011111001. The next prime is 21200011111141. The reversal of 21200011111012 is 21011111000212.

It is a happy number.

It is a super-2 number, since 2×21200011111012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21200011110983 and 21200011111001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2141439 + ... + 6854617.

It is an arithmetic number, because the mean of its divisors is an integer number (1583595487740).

Almost surely, 2^{21200011111012} is an apocalyptic number.

It is an amenable number.

21200011111012 is a deficient number, since it is larger than the sum of its proper divisors (16806280594748).

21200011111012 is a wasteful number, since it uses less digits than its factorization.

21200011111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740651 (or 4740649 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21200011111012 its reverse (21011111000212), we get a palindrome (42211122111224).

The spelling of 21200011111012 in words is "twenty-one trillion, two hundred billion, eleven million, one hundred eleven thousand, twelve".