20121220010001 has 8 divisors (see below), whose sum is σ = 29267229105504. Its totient is φ = 12194678793920.

The previous prime is 20121220009997. The next prime is 20121220010009. The reversal of 20121220010001 is 10001002212102.

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 20121220010001 - 2² = 20121220009997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121220010009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304866969816 + ... + 304866969881.

It is an arithmetic number, because the mean of its divisors is an integer number (3658403638188).

Almost surely, 2^{20121220010001} is an apocalyptic number.

It is an amenable number.

20121220010001 is a deficient number, since it is larger than the sum of its proper divisors (9146009095503).

20121220010001 is a wasteful number, since it uses less digits than its factorization.

20121220010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609733939711.

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

Adding to 20121220010001 its reverse (10001002212102), we get a palindrome (30122222222103).

The spelling of 20121220010001 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, ten thousand, one".