21111000101012 has 48 divisors (see below), whose sum is σ = 37131246028800. Its totient is φ = 10502206460160.

The previous prime is 21111000101011. The next prime is 21111000101119. The reversal of 21111000101012 is 21010100011112.

It is a junction number, because it is equal to n+sod(n) for n = 21111000100984 and 21111000101002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111000101011) 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, 1999331789 + ... + 1999342347.

It is an arithmetic number, because the mean of its divisors is an integer number (773567625600).

Almost surely, 2^{21111000101012} is an apocalyptic number.

It is an amenable number.

21111000101012 is a deficient number, since it is larger than the sum of its proper divisors (16020245927788).

21111000101012 is a wasteful number, since it uses less digits than its factorization.

21111000101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13496 (or 13494 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21111000101012 its reverse (21010100011112), we get a palindrome (42121100112124).

The spelling of 21111000101012 in words is "twenty-one trillion, one hundred eleven billion, one hundred one thousand, twelve".