21002012202220 has 48 divisors (see below), whose sum is σ = 50412286790208. Its totient is φ = 7199624540160.

The previous prime is 21002012202191. The next prime is 21002012202221. The reversal of 21002012202220 is 2220221020012.

It is a junction number, because it is equal to n+sod(n) for n = 21002012202194 and 21002012202203.

It is not an unprimeable number, because it can be changed into a prime (21002012202221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10147557 + ... + 12040636.

It is an arithmetic number, because the mean of its divisors is an integer number (1050255974796).

Almost surely, 2^{21002012202220} is an apocalyptic number.

21002012202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002012202220 is an abundant number, since it is smaller than the sum of its proper divisors (29410274587988).

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

21002012202220 is a wasteful number, since it uses less digits than its factorization.

21002012202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22194970 (or 22194968 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21002012202220 its reverse (2220221020012), we get a palindrome (23222233222232).

The spelling of 21002012202220 in words is "twenty-one trillion, two billion, twelve million, two hundred two thousand, two hundred twenty".