20002101221 has 8 divisors (see below), whose sum is σ = 20081256480. Its totient is φ = 19923070288.

The previous prime is 20002101209. The next prime is 20002101227. The reversal of 20002101221 is 12210120002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20002101221 - 2²² = 19997906917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002101227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298175 + ... + 359043.

It is an arithmetic number, because the mean of its divisors is an integer number (2510157060).

Almost surely, 2^20002101221 is an apocalyptic number.

It is an amenable number.

20002101221 is a deficient number, since it is larger than the sum of its proper divisors (79155259).

20002101221 is an equidigital number, since it uses as much as digits as its factorization.

20002101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62163.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20002101221 its reverse (12210120002), we get a palindrome (32212221223).

The spelling of 20002101221 in words is "twenty billion, two million, one hundred one thousand, two hundred twenty-one".