21210312122 has 8 divisors (see below), whose sum is σ = 31902159936. Its totient is φ = 10576258812.

The previous prime is 21210312083. The next prime is 21210312181. The reversal of 21210312122 is 22121301212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21210312122.

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, 14447708 + ... + 14449175.

It is an arithmetic number, because the mean of its divisors is an integer number (3987769992).

Almost surely, 2^21210312122 is an apocalyptic number.

21210312122 is a deficient number, since it is larger than the sum of its proper divisors (10691847814).

21210312122 is a wasteful number, since it uses less digits than its factorization.

21210312122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28897252.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21210312122 its reverse (22121301212), we get a palindrome (43331613334).

The spelling of 21210312122 in words is "twenty-one billion, two hundred ten million, three hundred twelve thousand, one hundred twenty-two".