22001121021 has 16 divisors (see below), whose sum is σ = 32004126720. Its totient is φ = 13332972720.

The previous prime is 22001120993. The next prime is 22001121049. The reversal of 22001121021 is 12012110022.

It is an interprime number because it is at equal distance from previous prime (22001120993) and next prime (22001121049).

It is not a de Polignac number, because 22001121021 - 2⁶ = 22001120957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22001120988 and 22001121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001121091) 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, 742590 + ... + 771648.

It is an arithmetic number, because the mean of its divisors is an integer number (2000257920).

Almost surely, 2^22001121021 is an apocalyptic number.

It is an amenable number.

22001121021 is a deficient number, since it is larger than the sum of its proper divisors (10003005699).

22001121021 is a wasteful number, since it uses less digits than its factorization.

22001121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52016.

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

Adding to 22001121021 its reverse (12012110022), we get a palindrome (34013231043).

The spelling of 22001121021 in words is "twenty-two billion, one million, one hundred twenty-one thousand, twenty-one".