20001202221 has 192 divisors, whose sum is σ = 37747869696. Its totient is φ = 9138355200.

The previous prime is 20001202213. The next prime is 20001202231. The reversal of 20001202221 is 12220210002.

It is not a de Polignac number, because 20001202221 - 2³ = 20001202213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001202197 and 20001202206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001202231) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 88110910 + ... + 88111136.

It is an arithmetic number, because the mean of its divisors is an integer number (196603488).

Almost surely, 2^20001202221 is an apocalyptic number.

20001202221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20001202221 is a deficient number, since it is larger than the sum of its proper divisors (17746667475).

20001202221 is a wasteful number, since it uses less digits than its factorization.

20001202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20001202221 its reverse (12220210002), we get a palindrome (32221412223).

It can be divided in two parts, 20001 and 202221, that added together give a palindrome (222222).

The spelling of 20001202221 in words is "twenty billion, one million, two hundred two thousand, two hundred twenty-one".