21010221210 has 32 divisors (see below), whose sum is σ = 55008580032. Its totient is φ = 5093386880.

The previous prime is 21010221209. The next prime is 21010221227. The reversal of 21010221210 is 1212201012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31833339 + ... + 31833998.

It is an arithmetic number, because the mean of its divisors is an integer number (1719018126).

Almost surely, 2^21010221210 is an apocalyptic number.

21010221210 is an abundant number, since it is smaller than the sum of its proper divisors (33998358822).

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

21010221210 is a wasteful number, since it uses less digits than its factorization.

21010221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63667358.

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

Adding to 21010221210 its reverse (1212201012), we get a palindrome (22222422222).

The spelling of 21010221210 in words is "twenty-one billion, ten million, two hundred twenty-one thousand, two hundred ten".