22002121210021 has 8 divisors (see below), whose sum is σ = 22008702844184. Its totient is φ = 21995540202240.

The previous prime is 22002121209961. The next prime is 22002121210033. The reversal of 22002121210021 is 12001212120022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 238832577025 + 21763288632996 = 488705^2 + 4665114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22002121210021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22002121209977 and 22002121210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22002121210051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75509791 + ... + 75800611.

It is an arithmetic number, because the mean of its divisors is an integer number (2751087855523).

Almost surely, 2^{22002121210021} is an apocalyptic number.

It is an amenable number.

22002121210021 is a deficient number, since it is larger than the sum of its proper divisors (6581634163).

22002121210021 is a wasteful number, since it uses less digits than its factorization.

22002121210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313191.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22002121210021 its reverse (12001212120022), we get a palindrome (34003333330043).

The spelling of 22002121210021 in words is "twenty-two trillion, two billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".