21213420024354 has 16 divisors (see below), whose sum is σ = 42427043686848. Its totient is φ = 7071106068432.

The previous prime is 21213420024331. The next prime is 21213420024389. The reversal of 21213420024354 is 45342002431212.

It is a happy number.

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, 7113637 + ... + 9645240.

It is an arithmetic number, because the mean of its divisors is an integer number (2651690230428).

Almost surely, 2^{21213420024354} is an apocalyptic number.

21213420024354 is an abundant number, since it is smaller than the sum of its proper divisors (21213623662494).

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

21213420024354 is a wasteful number, since it uses less digits than its factorization.

21213420024354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16969849.

The product of its (nonzero) digits is 46080, while the sum is 33.

Adding to 21213420024354 its reverse (45342002431212), we get a palindrome (66555422455566).

The spelling of 21213420024354 in words is "twenty-one trillion, two hundred thirteen billion, four hundred twenty million, twenty-four thousand, three hundred fifty-four".