21211012103 has 4 divisors (see below), whose sum is σ = 21303636840. Its totient is φ = 21118387368.

The previous prime is 21211012099. The next prime is 21211012117. The reversal of 21211012103 is 30121011212.

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 21211012103 - 2² = 21211012099 is a prime.

It is a super-2 number, since 2×21211012103² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211012703) 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, 46312025 + ... + 46312482.

It is an arithmetic number, because the mean of its divisors is an integer number (5325909210).

Almost surely, 2^21211012103 is an apocalyptic number.

21211012103 is a deficient number, since it is larger than the sum of its proper divisors (92624737).

21211012103 is an equidigital number, since it uses as much as digits as its factorization.

21211012103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92624736.

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

Adding to 21211012103 its reverse (30121011212), we get a palindrome (51332023315).

The spelling of 21211012103 in words is "twenty-one billion, two hundred eleven million, twelve thousand, one hundred three".