21210012210 has 16 divisors (see below), whose sum is σ = 50904029376. Its totient is φ = 5656003248.

The previous prime is 21210012203. The next prime is 21210012269. The reversal of 21210012210 is 1221001212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353500174 + ... + 353500233.

It is an arithmetic number, because the mean of its divisors is an integer number (3181501836).

Almost surely, 2^21210012210 is an apocalyptic number.

21210012210 is an abundant number, since it is smaller than the sum of its proper divisors (29694017166).

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

21210012210 is a wasteful number, since it uses less digits than its factorization.

21210012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707000417.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210012210 its reverse (1221001212), we get a palindrome (22431013422).

The spelling of 21210012210 in words is "twenty-one billion, two hundred ten million, twelve thousand, two hundred ten".