21542522303 has 4 divisors (see below), whose sum is σ = 21561239808. Its totient is φ = 21523804800.

The previous prime is 21542522291. The next prime is 21542522311. The reversal of 21542522303 is 30322524512.

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 21542522303 - 2¹⁰ = 21542521279 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 (21542524303) 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, 9357026 + ... + 9359327.

It is an arithmetic number, because the mean of its divisors is an integer number (5390309952).

Almost surely, 2^21542522303 is an apocalyptic number.

21542522303 is a deficient number, since it is larger than the sum of its proper divisors (18717505).

21542522303 is a wasteful number, since it uses less digits than its factorization.

21542522303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18717504.

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 21542522303 in words is "twenty-one billion, five hundred forty-two million, five hundred twenty-two thousand, three hundred three".