21212231514 has 8 divisors (see below), whose sum is σ = 42424463040. Its totient is φ = 7070743836.

The previous prime is 21212231483. The next prime is 21212231531. The reversal of 21212231514 is 41513221212.

It is a happy number.

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

21212231514 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1767685954 + ... + 1767685965.

It is an arithmetic number, because the mean of its divisors is an integer number (5303057880).

Almost surely, 2^21212231514 is an apocalyptic number.

21212231514 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.

21212231514 is a wasteful number, since it uses less digits than its factorization.

21212231514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535371924.

The product of its digits is 960, while the sum is 24.

Adding to 21212231514 its reverse (41513221212), we get a palindrome (62725452726).

The spelling of 21212231514 in words is "twenty-one billion, two hundred twelve million, two hundred thirty-one thousand, five hundred fourteen".