20121220101 has 8 divisors (see below), whose sum is σ = 27093920544. Its totient is φ = 13281333200.

The previous prime is 20121220051. The next prime is 20121220103. The reversal of 20121220101 is 10102212102.

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 20121220101 - 2⁶ = 20121220037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121220103) 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, 33203031 + ... + 33203636.

It is an arithmetic number, because the mean of its divisors is an integer number (3386740068).

Almost surely, 2^20121220101 is an apocalyptic number.

It is an amenable number.

20121220101 is a deficient number, since it is larger than the sum of its proper divisors (6972700443).

20121220101 is a wasteful number, since it uses less digits than its factorization.

20121220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66406771.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20121220101 its reverse (10102212102), we get a palindrome (30223432203).

The spelling of 20121220101 in words is "twenty billion, one hundred twenty-one million, two hundred twenty thousand, one hundred one".