21111101222012 has 24 divisors (see below), whose sum is σ = 37106915030640. Its totient is φ = 10509214867200.

The previous prime is 21111101221967. The next prime is 21111101222021. The reversal of 21111101222012 is 21022210111112.

It is a congruent number.

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, 10225562 + ... + 12115457.

It is an arithmetic number, because the mean of its divisors is an integer number (1546121459610).

Almost surely, 2^{21111101222012} is an apocalyptic number.

It is an amenable number.

21111101222012 is a deficient number, since it is larger than the sum of its proper divisors (15995813808628).

21111101222012 is a wasteful number, since it uses less digits than its factorization.

21111101222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22342061 (or 22342059 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111101222012 its reverse (21022210111112), we get a palindrome (42133311333124).

The spelling of 21111101222012 in words is "twenty-one trillion, one hundred eleven billion, one hundred one million, two hundred twenty-two thousand, twelve".