21222220220010 has 48 divisors (see below), whose sum is σ = 55181329871616. Its totient is φ = 5658893874144.

The previous prime is 21222220219979. The next prime is 21222220220017. The reversal of 21222220220010 is 1002202222212.

21222220220010 is a `hidden beast` number, since 2 + 1 + 222 + 220 + 220 + 0 + 1 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21222220220017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6195874 + ... + 8990733.

It is an arithmetic number, because the mean of its divisors is an integer number (1149611038992).

Almost surely, 2^{21222220220010} is an apocalyptic number.

21222220220010 is an abundant number, since it is smaller than the sum of its proper divisors (33959109651606).

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

21222220220010 is a wasteful number, since it uses less digits than its factorization.

21222220220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15202147 (or 15202144 counting only the distinct ones).

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

Adding to 21222220220010 its reverse (1002202222212), we get a palindrome (22224422442222).

It can be divided in two parts, 212222202 and 20010, that added together give a palindrome (212242212).

The spelling of 21222220220010 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, two hundred twenty thousand, ten".