21220102222002 has 20 divisors (see below), whose sum is σ = 47548747571886. Its totient is φ = 7073367407280.

The previous prime is 21220102221977. The next prime is 21220102222021. The reversal of 21220102222002 is 20022220102212.

21220102222002 is a `hidden beast` number, since 21 + 220 + 1 + 0 + 222 + 200 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18282474191601 + 2937628030401 = 4275801^2 + 1713951^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65494142499 + ... + 65494142822.

Almost surely, 2^{21220102222002} is an apocalyptic number.

21220102222002 is an abundant number, since it is smaller than the sum of its proper divisors (26328645349884).

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

21220102222002 is a wasteful number, since it uses less digits than its factorization.

21220102222002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130988285335 (or 130988285326 counting only the distinct ones).

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

Adding to 21220102222002 its reverse (20022220102212), we get a palindrome (41242322324214).

The spelling of 21220102222002 in words is "twenty-one trillion, two hundred twenty billion, one hundred two million, two hundred twenty-two thousand, two".