21515152303 has 4 divisors (see below), whose sum is σ = 22647528760. Its totient is φ = 20382775848.

The previous prime is 21515152277. The next prime is 21515152313. The reversal of 21515152303 is 30325151512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21515152303 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 (21515152313) 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, 566188200 + ... + 566188237.

It is an arithmetic number, because the mean of its divisors is an integer number (5661882190).

Almost surely, 2^21515152303 is an apocalyptic number.

21515152303 is a deficient number, since it is larger than the sum of its proper divisors (1132376457).

21515152303 is a wasteful number, since it uses less digits than its factorization.

21515152303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132376456.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 21515152303 in words is "twenty-one billion, five hundred fifteen million, one hundred fifty-two thousand, three hundred three".