21103103442 has 32 divisors (see below), whose sum is σ = 44695141632. Its totient is φ = 6619660544.

The previous prime is 21103103429. The next prime is 21103103443. The reversal of 21103103442 is 24430130112.

It is not an unprimeable number, because it can be changed into a prime (21103103443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1417228 + ... + 1432040.

It is an arithmetic number, because the mean of its divisors is an integer number (1396723176).

Almost surely, 2^21103103442 is an apocalyptic number.

21103103442 is an abundant number, since it is smaller than the sum of its proper divisors (23592038190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103103442 is a wasteful number, since it uses less digits than its factorization.

21103103442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28802.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21103103442 its reverse (24430130112), we get a palindrome (45533233554).

The spelling of 21103103442 in words is "twenty-one billion, one hundred three million, one hundred three thousand, four hundred forty-two".