21372185103 has 16 divisors (see below), whose sum is σ = 30178778976. Its totient is φ = 13407206400.

The previous prime is 21372185099. The next prime is 21372185119. The reversal of 21372185103 is 30158127312.

It is a happy number.

It is not a de Polignac number, because 21372185103 - 2² = 21372185099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372185803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219075 + ... + 301227.

It is an arithmetic number, because the mean of its divisors is an integer number (1886173686).

Almost surely, 2^21372185103 is an apocalyptic number.

21372185103 is a deficient number, since it is larger than the sum of its proper divisors (8806593873).

21372185103 is a wasteful number, since it uses less digits than its factorization.

21372185103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87274.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 21372185103 in words is "twenty-one billion, three hundred seventy-two million, one hundred eighty-five thousand, one hundred three".