21202001202220 has 96 divisors (see below), whose sum is σ = 45574548445440. Its totient is φ = 8282753122560.

The previous prime is 21202001202197. The next prime is 21202001202241. The reversal of 21202001202220 is 2220210020212.

It is a junction number, because it is equal to n+sod(n) for n = 21202001202194 and 21202001202203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140100114 + ... + 140251366.

It is an arithmetic number, because the mean of its divisors is an integer number (474734879640).

Almost surely, 2^{21202001202220} is an apocalyptic number.

21202001202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202001202220 is an abundant number, since it is smaller than the sum of its proper divisors (24372547243220).

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

21202001202220 is a wasteful number, since it uses less digits than its factorization.

21202001202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152095 (or 152093 counting only the distinct ones).

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

Adding to 21202001202220 its reverse (2220210020212), we get a palindrome (23422211222432).

The spelling of 21202001202220 in words is "twenty-one trillion, two hundred two billion, one million, two hundred two thousand, two hundred twenty".