21122102001211 has 4 divisors (see below), whose sum is σ = 21122114532424. Its totient is φ = 21122089470000.

The previous prime is 21122102001191. The next prime is 21122102001239. The reversal of 21122102001211 is 11210020122112.

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 21122102001211 - 2³⁵ = 21087742262843 is a prime.

It is a super-2 number, since 2×21122102001211² (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 (21122102001241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3255105 + ... + 7269106.

It is an arithmetic number, because the mean of its divisors is an integer number (5280528633106).

Almost surely, 2^{21122102001211} is an apocalyptic number.

21122102001211 is a deficient number, since it is larger than the sum of its proper divisors (12531213).

21122102001211 is a wasteful number, since it uses less digits than its factorization.

21122102001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12531212.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21122102001211 its reverse (11210020122112), we get a palindrome (32332122123323).

The spelling of 21122102001211 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred two million, one thousand, two hundred eleven".