21122103011 has 4 divisors (see below), whose sum is σ = 21122459952. Its totient is φ = 21121746072.

The previous prime is 21122103007. The next prime is 21122103017. The reversal of 21122103011 is 11030122112.

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 21122103011 - 2² = 21122103007 is a prime.

It is a super-2 number, since 2×21122103011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122103017) 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, 66140 + ... + 215913.

It is an arithmetic number, because the mean of its divisors is an integer number (5280614988).

Almost surely, 2^21122103011 is an apocalyptic number.

21122103011 is a deficient number, since it is larger than the sum of its proper divisors (356941).

21122103011 is an equidigital number, since it uses as much as digits as its factorization.

21122103011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356940.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21122103011 its reverse (11030122112), we get a palindrome (32152225123).

The spelling of 21122103011 in words is "twenty-one billion, one hundred twenty-two million, one hundred three thousand, eleven".