21426226026 has 16 divisors (see below), whose sum is σ = 42861156384. Its totient is φ = 7140624624.

The previous prime is 21426226009. The next prime is 21426226051. The reversal of 21426226026 is 62062262412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330460 + ... + 389943.

It is an arithmetic number, because the mean of its divisors is an integer number (2678822274).

Almost surely, 2^21426226026 is an apocalyptic number.

21426226026 is an abundant number, since it is smaller than the sum of its proper divisors (21434930358).

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

21426226026 is a wasteful number, since it uses less digits than its factorization.

21426226026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725365.

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 21426226026 its reverse (62062262412), we get a palindrome (83488488438).

The spelling of 21426226026 in words is "twenty-one billion, four hundred twenty-six million, two hundred twenty-six thousand, twenty-six".