21533307320226 has 16 divisors (see below), whose sum is σ = 46379431151424. Its totient is φ = 6625633021584.

The previous prime is 21533307320209. The next prime is 21533307320263. The reversal of 21533307320226 is 62202370333512.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 138034021206 + ... + 138034021361.

It is an arithmetic number, because the mean of its divisors is an integer number (2898714446964).

Almost surely, 2^{21533307320226} is an apocalyptic number.

21533307320226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21533307320226 is an abundant number, since it is smaller than the sum of its proper divisors (24846123831198).

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

21533307320226 is a wasteful number, since it uses less digits than its factorization.

21533307320226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276068042585.

The product of its (nonzero) digits is 272160, while the sum is 39.

Adding to 21533307320226 its reverse (62202370333512), we get a palindrome (83735677653738).

The spelling of 21533307320226 in words is "twenty-one trillion, five hundred thirty-three billion, three hundred seven million, three hundred twenty thousand, two hundred twenty-six".