21210220002222 has 64 divisors (see below), whose sum is σ = 49827488256000. Its totient is φ = 6669217508544.

The previous prime is 21210220002217. The next prime is 21210220002277. The reversal of 21210220002222 is 22220002201212.

21210220002222 is a `hidden beast` number, since 212 + 10 + 220 + 0 + 0 + 2 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21210220002195 and 21210220002204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44123022 + ... + 44601137.

It is an arithmetic number, because the mean of its divisors is an integer number (778554504000).

Almost surely, 2^{21210220002222} is an apocalyptic number.

21210220002222 is an abundant number, since it is smaller than the sum of its proper divisors (28617268253778).

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

21210220002222 is a wasteful number, since it uses less digits than its factorization.

21210220002222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88724422 (or 88724416 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21210220002222 its reverse (22220002201212), we get a palindrome (43430222203434).

The spelling of 21210220002222 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, two thousand, two hundred twenty-two".