21025641503 has 8 divisors (see below), whose sum is σ = 21131984640. Its totient is φ = 20919510360.

The previous prime is 21025641409. The next prime is 21025641577. The reversal of 21025641503 is 30514652012.

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 21025641503 - 2³⁴ = 3845772319 is a prime.

It is a super-2 number, since 2×21025641503² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025644503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147776 + ... + 252762.

It is an arithmetic number, because the mean of its divisors is an integer number (2641498080).

Almost surely, 2^21025641503 is an apocalyptic number.

21025641503 is a deficient number, since it is larger than the sum of its proper divisors (106343137).

21025641503 is a wasteful number, since it uses less digits than its factorization.

21025641503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105997.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 21025641503 in words is "twenty-one billion, twenty-five million, six hundred forty-one thousand, five hundred three".