21103424342 has 32 divisors (see below), whose sum is σ = 42502005504. Its totient is φ = 7589642400.

The previous prime is 21103424311. The next prime is 21103424387. The reversal of 21103424342 is 24342430112.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5268584 + ... + 5272587.

It is an arithmetic number, because the mean of its divisors is an integer number (1328187672).

Almost surely, 2^21103424342 is an apocalyptic number.

21103424342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21103424342 is an abundant number, since it is smaller than the sum of its proper divisors (21398581162).

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

21103424342 is a wasteful number, since it uses less digits than its factorization.

21103424342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10541204.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21103424342 its reverse (24342430112), we get a palindrome (45445854454).

The spelling of 21103424342 in words is "twenty-one billion, one hundred three million, four hundred twenty-four thousand, three hundred forty-two".