21211112001 has 16 divisors (see below), whose sum is σ = 28388888640. Its totient is φ = 14087135040.

The previous prime is 21211111979. The next prime is 21211112017. The reversal of 21211112001 is 10021111212.

It is not a de Polignac number, because 21211112001 - 2¹⁴ = 21211095617 is a prime.

It is a super-2 number, since 2×21211112001² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21211112201) 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, 909871 + ... + 932891.

It is an arithmetic number, because the mean of its divisors is an integer number (1774305540).

Almost surely, 2^21211112001 is an apocalyptic number.

It is an amenable number.

21211112001 is a deficient number, since it is larger than the sum of its proper divisors (7177776639).

21211112001 is a wasteful number, since it uses less digits than its factorization.

21211112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24176.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211112001 its reverse (10021111212), we get a palindrome (31232223213).

The spelling of 21211112001 in words is "twenty-one billion, two hundred eleven million, one hundred twelve thousand, one".