21603136238 has 8 divisors (see below), whose sum is σ = 32725543320. Its totient is φ = 10694621800.

The previous prime is 21603136237. The next prime is 21603136241. The reversal of 21603136238 is 83263130612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21603136198 and 21603136207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603136237) 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 3 ways as a sum of consecutive naturals, for example, 53472908 + ... + 53473311.

It is an arithmetic number, because the mean of its divisors is an integer number (4090692915).

Almost surely, 2^21603136238 is an apocalyptic number.

21603136238 is a deficient number, since it is larger than the sum of its proper divisors (11122407082).

21603136238 is a wasteful number, since it uses less digits than its factorization.

21603136238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106946322.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 21603136238 in words is "twenty-one billion, six hundred three million, one hundred thirty-six thousand, two hundred thirty-eight".