21542046103 has 4 divisors (see below), whose sum is σ = 22236950848. Its totient is φ = 20847141360.

The previous prime is 21542046091. The next prime is 21542046109. The reversal of 21542046103 is 30164024512.

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 21542046103 - 2²¹ = 21539948951 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 (21542046109) 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, 347452326 + ... + 347452387.

It is an arithmetic number, because the mean of its divisors is an integer number (5559237712).

Almost surely, 2^21542046103 is an apocalyptic number.

21542046103 is a deficient number, since it is larger than the sum of its proper divisors (694904745).

21542046103 is an equidigital number, since it uses as much as digits as its factorization.

21542046103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694904744.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 21542046103 in words is "twenty-one billion, five hundred forty-two million, forty-six thousand, one hundred three".