21220220220102 has 32 divisors (see below), whose sum is σ = 47156229644160. Its totient is φ = 7073379033480.

The previous prime is 21220220220091. The next prime is 21220220220167. The reversal of 21220220220102 is 20102202202212.

21220220220102 is a `hidden beast` number, since 2 + 1 + 220 + 220 + 220 + 1 + 0 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16841013 + ... + 18057135.

It is an arithmetic number, because the mean of its divisors is an integer number (1473632176380).

Almost surely, 2^{21220220220102} is an apocalyptic number.

21220220220102 is an abundant number, since it is smaller than the sum of its proper divisors (25936009424058).

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

21220220220102 is a wasteful number, since it uses less digits than its factorization.

21220220220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539265 (or 1539259 counting only the distinct ones).

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

Adding to 21220220220102 its reverse (20102202202212), we get a palindrome (41322422422314).

The spelling of 21220220220102 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty million, two hundred twenty thousand, one hundred two".