21415315026 has 64 divisors (see below), whose sum is σ = 51441527808. Its totient is φ = 5814825408.

The previous prime is 21415315001. The next prime is 21415315027. The reversal of 21415315026 is 62051351412.

It is a junction number, because it is equal to n+sod(n) for n = 21415314984 and 21415315002.

It is not an unprimeable number, because it can be changed into a prime (21415315027) 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 31 ways as a sum of consecutive naturals, for example, 93420 + ... + 227063.

It is an arithmetic number, because the mean of its divisors is an integer number (803773872).

Almost surely, 2^21415315026 is an apocalyptic number.

21415315026 is an abundant number, since it is smaller than the sum of its proper divisors (30026212782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21415315026 is a wasteful number, since it uses less digits than its factorization.

21415315026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320575.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21415315026 its reverse (62051351412), we get a palindrome (83466666438).

The spelling of 21415315026 in words is "twenty-one billion, four hundred fifteen million, three hundred fifteen thousand, twenty-six".