21201212334 has 8 divisors (see below), whose sum is σ = 42402424680. Its totient is φ = 7067070776.

The previous prime is 21201212327. The next prime is 21201212359. The reversal of 21201212334 is 43321210212.

21201212334 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

21201212334 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21201212334.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766767689 + ... + 1766767700.

It is an arithmetic number, because the mean of its divisors is an integer number (5300303085).

Almost surely, 2^21201212334 is an apocalyptic number.

21201212334 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21201212334 is a wasteful number, since it uses less digits than its factorization.

21201212334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533535394.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21201212334 its reverse (43321210212), we get a palindrome (64522422546).

The spelling of 21201212334 in words is "twenty-one billion, two hundred one million, two hundred twelve thousand, three hundred thirty-four".