21122011001 has 16 divisors (see below), whose sum is σ = 26526864000. Its totient is φ = 16711917264.

The previous prime is 21122010997. The next prime is 21122011051. The reversal of 21122011001 is 10011022112.

It is not a de Polignac number, because 21122011001 - 2² = 21122010997 is a prime.

It is a super-2 number, since 2×21122011001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122011051) 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, 2364011 + ... + 2372928.

It is an arithmetic number, because the mean of its divisors is an integer number (1657929000).

Almost surely, 2^21122011001 is an apocalyptic number.

It is an amenable number.

21122011001 is a deficient number, since it is larger than the sum of its proper divisors (5404852999).

21122011001 is an equidigital number, since it uses as much as digits as its factorization.

21122011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736973 (or 4736959 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21122011001 its reverse (10011022112), we get a palindrome (31133033113).

The spelling of 21122011001 in words is "twenty-one billion, one hundred twenty-two million, eleven thousand, one".