21212201102222 has 16 divisors (see below), whose sum is σ = 34294394479632. Its totient is φ = 9782094902400.

The previous prime is 21212201102179. The next prime is 21212201102269. The reversal of 21212201102222 is 22220110221212.

It is a super-2 number, since 2×21212201102222² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212201102194 and 21212201102203.

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, 339624848 + ... + 339687299.

It is an arithmetic number, because the mean of its divisors is an integer number (2143399654977).

Almost surely, 2^{21212201102222} is an apocalyptic number.

21212201102222 is a deficient number, since it is larger than the sum of its proper divisors (13082193377410).

21212201102222 is a wasteful number, since it uses less digits than its factorization.

21212201102222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679313363.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21212201102222 its reverse (22220110221212), we get a palindrome (43432311323434).

The spelling of 21212201102222 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, one hundred two thousand, two hundred twenty-two".