22002120021 has 16 divisors (see below), whose sum is σ = 33592924800. Its totient is φ = 12547933248.

The previous prime is 22002119977. The next prime is 22002120047. The reversal of 22002120021 is 12002120022.

It is not a de Polignac number, because 22002120021 - 2⁶ = 22002119957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22002119979 and 22002120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22002120121) 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, 1018506 + ... + 1039883.

It is an arithmetic number, because the mean of its divisors is an integer number (2099557800).

Almost surely, 2^22002120021 is an apocalyptic number.

22002120021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22002120021 is a deficient number, since it is larger than the sum of its proper divisors (11590804779).

22002120021 is a wasteful number, since it uses less digits than its factorization.

22002120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058908.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22002120021 its reverse (12002120022), we get a palindrome (34004240043).

Subtracting from 22002120021 its reverse (12002120022), we obtain a palindrome (9999999999).

It can be divided in two parts, 220021 and 20021, that added together give a palindrome (240042).

The spelling of 22002120021 in words is "twenty-two billion, two million, one hundred twenty thousand, twenty-one".