21112011001 has 16 divisors (see below), whose sum is σ = 21632878800. Its totient is φ = 20597195520.

The previous prime is 21112010939. The next prime is 21112011047. The reversal of 21112011001 is 10011021112.

It can be written as a sum of positive squares in 8 ways, for example, as 14926974976 + 6185036025 = 122176^2 + 78645^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112011001 - 2¹³ = 21112002809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112011091) 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, 9206011 + ... + 9208303.

It is an arithmetic number, because the mean of its divisors is an integer number (1352054925).

Almost surely, 2^21112011001 is an apocalyptic number.

It is an amenable number.

21112011001 is a deficient number, since it is larger than the sum of its proper divisors (520867799).

21112011001 is a wasteful number, since it uses less digits than its factorization.

21112011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3516.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21112011001 its reverse (10011021112), we get a palindrome (31123032113).

The spelling of 21112011001 in words is "twenty-one billion, one hundred twelve million, eleven thousand, one".