22022220021 has 16 divisors (see below), whose sum is σ = 30784842240. Its totient is φ = 13976590320.

The previous prime is 22022220001. The next prime is 22022220037. The reversal of 22022220021 is 12002222022.

It is not a de Polignac number, because 22022220021 - 2⁶ = 22022219957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22022220001) 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, 741751 + ... + 770868.

It is an arithmetic number, because the mean of its divisors is an integer number (1924052640).

Almost surely, 2^22022220021 is an apocalyptic number.

It is an amenable number.

22022220021 is a deficient number, since it is larger than the sum of its proper divisors (8762622219).

22022220021 is a wasteful number, since it uses less digits than its factorization.

22022220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512856.

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 22022220021 its reverse (12002222022), we get a palindrome (34024442043).

The spelling of 22022220021 in words is "twenty-two billion, twenty-two million, two hundred twenty thousand, twenty-one".