21111220110001 has 16 divisors (see below), whose sum is σ = 24970374535680. Its totient is φ = 17471982136320.

The previous prime is 21111220109999. The next prime is 21111220110031. The reversal of 21111220110001 is 10001102211112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21111220110001 - 2¹ = 21111220109999 is a prime.

It is a super-2 number, since 2×21111220110001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21111220110031) 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, 379138441 + ... + 379194118.

It is an arithmetic number, because the mean of its divisors is an integer number (1560648408480).

Almost surely, 2^{21111220110001} is an apocalyptic number.

It is an amenable number.

21111220110001 is a deficient number, since it is larger than the sum of its proper divisors (3859154425679).

21111220110001 is an equidigital number, since it uses as much as digits as its factorization.

21111220110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758332704.

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

Adding to 21111220110001 its reverse (10001102211112), we get a palindrome (31112322321113).

The spelling of 21111220110001 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, one hundred ten thousand, one".