21256032253503 has 16 divisors (see below), whose sum is σ = 28365439424256. Its totient is φ = 14158660829760.

The previous prime is 21256032253427. The next prime is 21256032253523. The reversal of 21256032253503 is 30535223065212.

It is not a de Polignac number, because 21256032253503 - 2¹² = 21256032249407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256032253523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19813750 + ... + 20858972.

It is an arithmetic number, because the mean of its divisors is an integer number (1772839964016).

Almost surely, 2^{21256032253503} is an apocalyptic number.

21256032253503 is a deficient number, since it is larger than the sum of its proper divisors (7109407170753).

21256032253503 is a wasteful number, since it uses less digits than its factorization.

21256032253503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050974.

The product of its (nonzero) digits is 324000, while the sum is 39.

The spelling of 21256032253503 in words is "twenty-one trillion, two hundred fifty-six billion, thirty-two million, two hundred fifty-three thousand, five hundred three".