21256043103203 has 8 divisors (see below), whose sum is σ = 22564255652640. Its totient is φ = 19954259117440.

The previous prime is 21256043103181. The next prime is 21256043103221. The reversal of 21256043103203 is 30230134065212.

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

It is a cyclic number.

It is not a de Polignac number, because 21256043103203 - 2²² = 21256038908899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21256043103203.

It is not an unprimeable number, because it can be changed into a prime (21256043103263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1607134103 + ... + 1607147328.

It is an arithmetic number, because the mean of its divisors is an integer number (2820531956580).

Almost surely, 2^{21256043103203} is an apocalyptic number.

21256043103203 is a deficient number, since it is larger than the sum of its proper divisors (1308212549437).

21256043103203 is a wasteful number, since it uses less digits than its factorization.

21256043103203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214281837.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 21256043103203 its reverse (30230134065212), we get a palindrome (51486177168415).

The spelling of 21256043103203 in words is "twenty-one trillion, two hundred fifty-six billion, forty-three million, one hundred three thousand, two hundred three".