21122500103 has 4 divisors (see below), whose sum is σ = 21131169960. Its totient is φ = 21113830248.

The previous prime is 21122500093. The next prime is 21122500109. The reversal of 21122500103 is 30100522112.

It is a happy number.

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 21122500103 - 2¹² = 21122496007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122500109) 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, 4331273 + ... + 4336146.

It is an arithmetic number, because the mean of its divisors is an integer number (5282792490).

Almost surely, 2^21122500103 is an apocalyptic number.

21122500103 is a deficient number, since it is larger than the sum of its proper divisors (8669857).

21122500103 is an equidigital number, since it uses as much as digits as its factorization.

21122500103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8669856.

The product of its (nonzero) digits is 120, while the sum is 17.

The spelling of 21122500103 in words is "twenty-one billion, one hundred twenty-two million, five hundred thousand, one hundred three".