22120000021 has 16 divisors (see below), whose sum is σ = 25435872000. Its totient is φ = 18843314688.

The previous prime is 22119999983. The next prime is 22120000031. The reversal of 22120000021 is 12000002122.

It is a cyclic number.

It is not a de Polignac number, because 22120000021 - 2¹⁷ = 22119868949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22119999962 and 22120000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22120000031) 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, 1285551 + ... + 1302643.

It is an arithmetic number, because the mean of its divisors is an integer number (1589742000).

Almost surely, 2^22120000021 is an apocalyptic number.

It is an amenable number.

22120000021 is a deficient number, since it is larger than the sum of its proper divisors (3315871979).

22120000021 is a wasteful number, since it uses less digits than its factorization.

22120000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18228.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 22120000021 its reverse (12000002122), we get a palindrome (34120002143).

It can be divided in two parts, 22 and 120000021, that multiplied together give a palindrome (2640000462).

The spelling of 22120000021 in words is "twenty-two billion, one hundred twenty million, twenty-one", and thus it is an aban number.