22001210021 has 16 divisors (see below), whose sum is σ = 25788837888. Its totient is φ = 18376772400.

The previous prime is 22001210009. The next prime is 22001210053. The reversal of 22001210021 is 12001210022.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-22001210021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22001209984 and 22001210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001210081) 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, 44936 + ... + 214526.

It is an arithmetic number, because the mean of its divisors is an integer number (1611802368).

Almost surely, 2^22001210021 is an apocalyptic number.

It is an amenable number.

22001210021 is a deficient number, since it is larger than the sum of its proper divisors (3787627867).

22001210021 is a wasteful number, since it uses less digits than its factorization.

22001210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170072.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22001210021 its reverse (12001210022), we get a palindrome (34002420043).

Subtracting from 22001210021 its reverse (12001210022), we obtain a palindrome (9999999999).

The spelling of 22001210021 in words is "twenty-two billion, one million, two hundred ten thousand, twenty-one".