22002400420021 has 16 divisors (see below), whose sum is σ = 25494248513664. Its totient is φ = 18598530210624.

The previous prime is 22002400420009. The next prime is 22002400420087. The reversal of 22002400420021 is 12002400420022.

It is not a de Polignac number, because 22002400420021 - 2²¹ = 22002398322869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22002400420001) 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, 33670890 + ... + 34318123.

It is an arithmetic number, because the mean of its divisors is an integer number (1593390532104).

Almost surely, 2^{22002400420021} is an apocalyptic number.

It is an amenable number.

22002400420021 is a deficient number, since it is larger than the sum of its proper divisors (3491848093643).

22002400420021 is an equidigital number, since it uses as much as digits as its factorization.

22002400420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67989660.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 22002400420021 its reverse (12002400420022), we get a palindrome (34004800840043).

Subtracting from 22002400420021 its reverse (12002400420022), we obtain a palindrome (9999999999999).

The spelling of 22002400420021 in words is "twenty-two trillion, two billion, four hundred million, four hundred twenty thousand, twenty-one".