21250250133403 has 32 divisors (see below), whose sum is σ = 21695275719936. Its totient is φ = 20810648936448.

The previous prime is 21250250133313. The next prime is 21250250133433. The reversal of 21250250133403 is 30433105205212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250250133403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250250133433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6605609251 + ... + 6605612467.

It is an arithmetic number, because the mean of its divisors is an integer number (677977366248).

Almost surely, 2^{21250250133403} is an apocalyptic number.

21250250133403 is a deficient number, since it is larger than the sum of its proper divisors (445025586533).

21250250133403 is a wasteful number, since it uses less digits than its factorization.

21250250133403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4843.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21250250133403 its reverse (30433105205212), we get a palindrome (51683355338615).

The spelling of 21250250133403 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty million, one hundred thirty-three thousand, four hundred three".