20021220202101 has 16 divisors (see below), whose sum is σ = 27944201945088. Its totient is φ = 12734987857200.

The previous prime is 20021220202069. The next prime is 20021220202103. The reversal of 20021220202101 is 10120202212002.

It is not a de Polignac number, because 20021220202101 - 2⁵ = 20021220202069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021220202103) 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, 1516063381 + ... + 1516076586.

It is an arithmetic number, because the mean of its divisors is an integer number (1746512621568).

Almost surely, 2^{20021220202101} is an apocalyptic number.

It is an amenable number.

20021220202101 is a deficient number, since it is larger than the sum of its proper divisors (7922981742987).

20021220202101 is a wasteful number, since it uses less digits than its factorization.

20021220202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032140072.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021220202101 its reverse (10120202212002), we get a palindrome (30141422414103).

The spelling of 20021220202101 in words is "twenty trillion, twenty-one billion, two hundred twenty million, two hundred two thousand, one hundred one".