21212032334420 has 48 divisors (see below), whose sum is σ = 44716773644928. Its totient is φ = 8452148254080.

The previous prime is 21212032334399. The next prime is 21212032334431. The reversal of 21212032334420 is 2443323021212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125929655 + ... + 126097985.

It is an arithmetic number, because the mean of its divisors is an integer number (931599450936).

Almost surely, 2^{21212032334420} is an apocalyptic number.

21212032334420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212032334420 is an abundant number, since it is smaller than the sum of its proper divisors (23504741310508).

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

21212032334420 is a wasteful number, since it uses less digits than its factorization.

21212032334420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192560 (or 192558 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21212032334420 its reverse (2443323021212), we get a palindrome (23655355355632).

The spelling of 21212032334420 in words is "twenty-one trillion, two hundred twelve billion, thirty-two million, three hundred thirty-four thousand, four hundred twenty".