21202201223220 has 48 divisors (see below), whose sum is σ = 59367358370880. Its totient is φ = 5653806521856.

The previous prime is 21202201223201. The next prime is 21202201223221. The reversal of 21202201223220 is 2232210220212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202201223221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529390 + ... + 6533349.

It is an arithmetic number, because the mean of its divisors is an integer number (1236819966060).

Almost surely, 2^{21202201223220} is an apocalyptic number.

21202201223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202201223220 is an abundant number, since it is smaller than the sum of its proper divisors (38165157147660).

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

21202201223220 is a wasteful number, since it uses less digits than its factorization.

21202201223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7112784 (or 7112782 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21202201223220 its reverse (2232210220212), we get a palindrome (23434411443432).

The spelling of 21202201223220 in words is "twenty-one trillion, two hundred two billion, two hundred one million, two hundred twenty-three thousand, two hundred twenty".