21521702103 has 32 divisors (see below), whose sum is σ = 31919235840. Its totient is φ = 12787607040.

The previous prime is 21521702099. The next prime is 21521702113. The reversal of 21521702103 is 30120712512.

It is not a de Polignac number, because 21521702103 - 2² = 21521702099 is a prime.

It is a super-2 number, since 2×21521702103² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21521702113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2757775 + ... + 2765567.

It is an arithmetic number, because the mean of its divisors is an integer number (997476120).

Almost surely, 2^21521702103 is an apocalyptic number.

21521702103 is a deficient number, since it is larger than the sum of its proper divisors (10397533737).

21521702103 is a wasteful number, since it uses less digits than its factorization.

21521702103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9439.

The product of its (nonzero) digits is 840, while the sum is 24.

The spelling of 21521702103 in words is "twenty-one billion, five hundred twenty-one million, seven hundred two thousand, one hundred three".