21210220222002 has 40 divisors (see below), whose sum is σ = 54316119513216. Its totient is φ = 6060062920248.

The previous prime is 21210220221989. The next prime is 21210220222007. The reversal of 21210220222002 is 20022202201212.

21210220222002 is a `hidden beast` number, since 212 + 10 + 220 + 2 + 220 + 0 + 2 = 666.

It is a super-3 number, since 3×21210220222002³ (a number of 41 digits) contains 333 as substring.

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 (21210220222007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9351947818 + ... + 9351950085.

Almost surely, 2^{21210220222002} is an apocalyptic number.

21210220222002 is an abundant number, since it is smaller than the sum of its proper divisors (33105899291214).

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

21210220222002 is a wasteful number, since it uses less digits than its factorization.

21210220222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18703897924 (or 18703897915 counting only the distinct ones).

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

Adding to 21210220222002 its reverse (20022202201212), we get a palindrome (41232422423214).

The spelling of 21210220222002 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, two hundred twenty-two thousand, two".