21001223103 has 32 divisors (see below), whose sum is σ = 33181209600. Its totient is φ = 11560340736.

The previous prime is 21001223083. The next prime is 21001223137. The reversal of 21001223103 is 30132210012.

It is not a de Polignac number, because 21001223103 - 2⁹ = 21001222591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001223303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228075 + ... + 306627.

It is an arithmetic number, because the mean of its divisors is an integer number (1036912800).

Almost surely, 2^21001223103 is an apocalyptic number.

21001223103 is a deficient number, since it is larger than the sum of its proper divisors (12179986497).

21001223103 is a wasteful number, since it uses less digits than its factorization.

21001223103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79031.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21001223103 its reverse (30132210012), we get a palindrome (51133433115).

The spelling of 21001223103 in words is "twenty-one billion, one million, two hundred twenty-three thousand, one hundred three".