21242465026 has 16 divisors (see below), whose sum is σ = 33034614840. Its totient is φ = 10232530560.

The previous prime is 21242465021. The next prime is 21242465047. The reversal of 21242465026 is 62056424212.

It can be written as a sum of positive squares in 4 ways, for example, as 21232861225 + 9603801 = 145715^2 + 3099^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21242464982 and 21242465000.

It is not an unprimeable number, because it can be changed into a prime (21242465021) 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, 374205 + ... + 427216.

Almost surely, 2^21242465026 is an apocalyptic number.

21242465026 is a deficient number, since it is larger than the sum of its proper divisors (11792149814).

21242465026 is a wasteful number, since it uses less digits than its factorization.

21242465026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801909.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 21242465026 its reverse (62056424212), we get a palindrome (83298889238).

The spelling of 21242465026 in words is "twenty-one billion, two hundred forty-two million, four hundred sixty-five thousand, twenty-six".