21210002122 has 8 divisors (see below), whose sum is σ = 31845864672. Its totient is φ = 10594713900.

The previous prime is 21210002117. The next prime is 21210002123. The reversal of 21210002122 is 22120001212.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21210002123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5141004 + ... + 5145127.

It is an arithmetic number, because the mean of its divisors is an integer number (3980733084).

Almost surely, 2^21210002122 is an apocalyptic number.

21210002122 is a deficient number, since it is larger than the sum of its proper divisors (10635862550).

21210002122 is a wasteful number, since it uses less digits than its factorization.

21210002122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10287164.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21210002122 its reverse (22120001212), we get a palindrome (43330003334).

The spelling of 21210002122 in words is "twenty-one billion, two hundred ten million, two thousand, one hundred twenty-two".