21256030603263 has 8 divisors (see below), whose sum is σ = 28483793104000. Its totient is φ = 14099477585688.

The previous prime is 21256030603187. The next prime is 21256030603271. The reversal of 21256030603263 is 36230603065212.

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

It is not a de Polignac number, because 21256030603263 - 2¹⁶ = 21256030537727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256030603963) 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, 17802370093 + ... + 17802371286.

It is an arithmetic number, because the mean of its divisors is an integer number (3560474138000).

Almost surely, 2^{21256030603263} is an apocalyptic number.

21256030603263 is a deficient number, since it is larger than the sum of its proper divisors (7227762500737).

21256030603263 is a wasteful number, since it uses less digits than its factorization.

21256030603263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35604741581.

The product of its (nonzero) digits is 233280, while the sum is 39.

Adding to 21256030603263 its reverse (36230603065212), we get a palindrome (57486633668475).

The spelling of 21256030603263 in words is "twenty-one trillion, two hundred fifty-six billion, thirty million, six hundred three thousand, two hundred sixty-three".