21122102121011 has 4 divisors (see below), whose sum is σ = 21122707772832. Its totient is φ = 21121496469192.

The previous prime is 21122102120989. The next prime is 21122102121037. The reversal of 21122102121011 is 11012120122112.

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 21122102121011 - 2²² = 21122097926707 is a prime.

It is a super-2 number, since 2×21122102121011² (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 (21122108121011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302773595 + ... + 302843348.

It is an arithmetic number, because the mean of its divisors is an integer number (5280676943208).

Almost surely, 2^{21122102121011} is an apocalyptic number.

21122102121011 is a deficient number, since it is larger than the sum of its proper divisors (605651821).

21122102121011 is an equidigital number, since it uses as much as digits as its factorization.

21122102121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605651820.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21122102121011 its reverse (11012120122112), we get a palindrome (32134222243123).

The spelling of 21122102121011 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred two million, one hundred twenty-one thousand, eleven".