22000022000021 has 8 divisors (see below), whose sum is σ = 24080730260664. Its totient is φ = 19974799293120.

The previous prime is 22000022000017. The next prime is 22000022000039. The reversal of 22000022000021 is 12000022000022.

It can be written as a sum of positive squares in 4 ways, for example, as 14107500625 + 21985914499396 = 118775^2 + 4688914^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22000022000021 - 2² = 22000022000017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22000021999966 and 22000022000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000022000821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13871387606 + ... + 13871389191.

It is an arithmetic number, because the mean of its divisors is an integer number (3010091282583).

Almost surely, 2^{22000022000021} is an apocalyptic number.

It is an amenable number.

22000022000021 is a deficient number, since it is larger than the sum of its proper divisors (2080708260643).

22000022000021 is a wasteful number, since it uses less digits than its factorization.

22000022000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27742776871.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 22000022000021 its reverse (12000022000022), we get a palindrome (34000044000043).

Subtracting from 22000022000021 its reverse (12000022000022), we obtain a palindrome (9999999999999).

The spelling of 22000022000021 in words is "twenty-two trillion, twenty-two million, twenty-one", and thus it is an aban number and an uban number.