21203965238 has 4 divisors (see below), whose sum is σ = 31805947860. Its totient is φ = 10601982618.

The previous prime is 21203965201. The next prime is 21203965243. The reversal of 21203965238 is 83256930212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21203965195 and 21203965204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300991308 + ... + 5300991311.

It is an arithmetic number, because the mean of its divisors is an integer number (7951486965).

Almost surely, 2^21203965238 is an apocalyptic number.

21203965238 is a deficient number, since it is larger than the sum of its proper divisors (10601982622).

21203965238 is a wasteful number, since it uses less digits than its factorization.

21203965238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601982621.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 21203965238 in words is "twenty-one billion, two hundred three million, nine hundred sixty-five thousand, two hundred thirty-eight".