21222021012211 has 32 divisors (see below), whose sum is σ = 22106378004480. Its totient is φ = 20359428921216.

The previous prime is 21222021012173. The next prime is 21222021012217. The reversal of 21222021012211 is 11221012022212.

It is a cyclic number.

It is not a de Polignac number, because 21222021012211 - 2⁷ = 21222021012083 is a prime.

It is a super-2 number, since 2×21222021012211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222021012217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287224605 + ... + 287298481.

It is an arithmetic number, because the mean of its divisors is an integer number (690824312640).

Almost surely, 2^{21222021012211} is an apocalyptic number.

21222021012211 is a deficient number, since it is larger than the sum of its proper divisors (884356992269).

21222021012211 is a wasteful number, since it uses less digits than its factorization.

21222021012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74563.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21222021012211 its reverse (11221012022212), we get a palindrome (32443033034423).

The spelling of 21222021012211 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, twelve thousand, two hundred eleven".