21210201222 has 16 divisors (see below), whose sum is σ = 48480460032. Its totient is φ = 6060057480.

The previous prime is 21210201217. The next prime is 21210201241. The reversal of 21210201222 is 22210201212.

It is a congruent number.

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, 252502354 + ... + 252502437.

It is an arithmetic number, because the mean of its divisors is an integer number (3030028752).

Almost surely, 2^21210201222 is an apocalyptic number.

21210201222 is an abundant number, since it is smaller than the sum of its proper divisors (27270258810).

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

21210201222 is a wasteful number, since it uses less digits than its factorization.

21210201222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505004803.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21210201222 its reverse (22210201212), we get a palindrome (43420402434).

The spelling of 21210201222 in words is "twenty-one billion, two hundred ten million, two hundred one thousand, two hundred twenty-two".