22021221011 has 4 divisors (see below), whose sum is σ = 22022129712. Its totient is φ = 22020312312.

The previous prime is 22021220987. The next prime is 22021221023. The reversal of 22021221011 is 11012212022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22021221011 - 2¹⁸ = 22020958867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021221091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416975 + ... + 466808.

It is an arithmetic number, because the mean of its divisors is an integer number (5505532428).

Almost surely, 2^22021221011 is an apocalyptic number.

22021221011 is a deficient number, since it is larger than the sum of its proper divisors (908701).

22021221011 is an equidigital number, since it uses as much as digits as its factorization.

22021221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908700.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22021221011 its reverse (11012212022), we get a palindrome (33033433033).

The spelling of 22021221011 in words is "twenty-two billion, twenty-one million, two hundred twenty-one thousand, eleven".