21450225641 has 16 divisors (see below), whose sum is σ = 23209599504. Its totient is φ = 19706609664.

The previous prime is 21450225631. The next prime is 21450225647. The reversal of 21450225641 is 14652205412.

It can be written as a sum of positive squares in 8 ways, for example, as 1237632400 + 20212593241 = 35180^2 + 142171^2 .

It is a cyclic number.

It is not a de Polignac number, because 21450225641 - 2¹⁰ = 21450224617 is a prime.

It is a super-2 number, since 2×21450225641² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21450225598 and 21450225607.

It is not an unprimeable number, because it can be changed into a prime (21450225647) 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, 5935151 + ... + 5938763.

It is an arithmetic number, because the mean of its divisors is an integer number (1450599969).

Almost surely, 2^21450225641 is an apocalyptic number.

It is an amenable number.

21450225641 is a deficient number, since it is larger than the sum of its proper divisors (1759373863).

21450225641 is a wasteful number, since it uses less digits than its factorization.

21450225641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660.

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 21450225641 in words is "twenty-one billion, four hundred fifty million, two hundred twenty-five thousand, six hundred forty-one".