21215023334 has 8 divisors (see below), whose sum is σ = 32258460360. Its totient is φ = 10462203216.

The previous prime is 21215023307. The next prime is 21215023369. The reversal of 21215023334 is 43332051212.

It is a happy number.

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

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, 72654044 + ... + 72654335.

It is an arithmetic number, because the mean of its divisors is an integer number (4032307545).

Almost surely, 2^21215023334 is an apocalyptic number.

21215023334 is a deficient number, since it is larger than the sum of its proper divisors (11043437026).

21215023334 is a wasteful number, since it uses less digits than its factorization.

21215023334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145308454.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21215023334 its reverse (43332051212), we get a palindrome (64547074546).

The spelling of 21215023334 in words is "twenty-one billion, two hundred fifteen million, twenty-three thousand, three hundred thirty-four".