21222220012011 has 16 divisors (see below), whose sum is σ = 31680328437120. Its totient is φ = 14040145552680.

The previous prime is 21222220011973. The next prime is 21222220012031. The reversal of 21222220012011 is 11021002222212.

It is a happy number.

21222220012011 is a `hidden beast` number, since 21 + 222 + 220 + 0 + 1 + 201 + 1 = 666.

It is not a de Polignac number, because 21222220012011 - 2⁶ = 21222220011947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222220012031) 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, 3000027565 + ... + 3000034638.

It is an arithmetic number, because the mean of its divisors is an integer number (1980020527320).

Almost surely, 2^{21222220012011} is an apocalyptic number.

21222220012011 is a deficient number, since it is larger than the sum of its proper divisors (10458108425109).

21222220012011 is a wasteful number, since it uses less digits than its factorization.

21222220012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000062343 (or 6000062337 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222220012011 its reverse (11021002222212), we get a palindrome (32243222234223).

The spelling of 21222220012011 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, twelve thousand, eleven".