21222212121010 has 16 divisors (see below), whose sum is σ = 38200041028800. Its totient is φ = 8488871690416.

The previous prime is 21222212120983. The next prime is 21222212121013. The reversal of 21222212121010 is 1012121222212.

It is not an unprimeable number, because it can be changed into a prime (21222212121013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7608051 + ... + 10016329.

It is an arithmetic number, because the mean of its divisors is an integer number (2387502564300).

Almost surely, 2^{21222212121010} is an apocalyptic number.

21222212121010 is a deficient number, since it is larger than the sum of its proper divisors (16977828907790).

21222212121010 is a wasteful number, since it uses less digits than its factorization.

21222212121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289505.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21222212121010 its reverse (1012121222212), we get a palindrome (22234333343222).

It can be divided in two parts, 212 and 22212121010, that added together give a palindrome (22212121222).

The spelling of 21222212121010 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, ten".