21022001121 has 32 divisors (see below), whose sum is σ = 31527682560. Its totient is φ = 12349209600.

The previous prime is 21022001101. The next prime is 21022001153. The reversal of 21022001121 is 12110022012.

It is not a de Polignac number, because 21022001121 - 2⁵ = 21022001089 is a prime.

It is a super-2 number, since 2×21022001121² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21022001097 and 21022001106.

It is not an unprimeable number, because it can be changed into a prime (21022001101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129345 + ... + 242433.

It is an arithmetic number, because the mean of its divisors is an integer number (985240080).

Almost surely, 2^21022001121 is an apocalyptic number.

It is an amenable number.

21022001121 is a deficient number, since it is larger than the sum of its proper divisors (10505681439).

21022001121 is a wasteful number, since it uses less digits than its factorization.

21022001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113277.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21022001121 its reverse (12110022012), we get a palindrome (33132023133).

The spelling of 21022001121 in words is "twenty-one billion, twenty-two million, one thousand, one hundred twenty-one".