22001121210021 has 16 divisors (see below), whose sum is σ = 29361651103680. Its totient is φ = 14654005816320.

The previous prime is 22001121209971. The next prime is 22001121210031. The reversal of 22001121210021 is 12001212110022.

It is not a de Polignac number, because 22001121210021 - 2²⁹ = 22000584339109 is a prime.

It is a super-2 number, since 2×22001121210021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001121210031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28443531 + ... + 29206791.

It is an arithmetic number, because the mean of its divisors is an integer number (1835103193980).

Almost surely, 2^{22001121210021} is an apocalyptic number.

It is an amenable number.

22001121210021 is a deficient number, since it is larger than the sum of its proper divisors (7360529893659).

22001121210021 is a wasteful number, since it uses less digits than its factorization.

22001121210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772036.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 22001121210021 its reverse (12001212110022), we get a palindrome (34002333320043).

Subtracting from 22001121210021 its reverse (12001212110022), we obtain a palindrome (9999909099999).

The spelling of 22001121210021 in words is "twenty-two trillion, one billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".