21111222012101 has 16 divisors (see below), whose sum is σ = 23380284916800. Its totient is φ = 18941741816448.

The previous prime is 21111222012043. The next prime is 21111222012107. The reversal of 21111222012101 is 10121022211112.

It is a cyclic number.

It is not a de Polignac number, because 21111222012101 - 2⁶ = 21111222012037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111222012101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111222012107) 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, 154563251 + ... + 154699776.

It is an arithmetic number, because the mean of its divisors is an integer number (1461267807300).

Almost surely, 2^{21111222012101} is an apocalyptic number.

It is an amenable number.

21111222012101 is a deficient number, since it is larger than the sum of its proper divisors (2269062904699).

21111222012101 is a wasteful number, since it uses less digits than its factorization.

21111222012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309263188.

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

Adding to 21111222012101 its reverse (10121022211112), we get a palindrome (31232244223213).

The spelling of 21111222012101 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-two million, twelve thousand, one hundred one".