1220120100001 has 4 divisors (see below), whose sum is σ = 1331040109104. Its totient is φ = 1109200090900.

The previous prime is 1220120099971. The next prime is 1220120100037. The reversal of 1220120100001 is 1000010210221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1220120100001 - 2⁷ = 1220120099873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220120101001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55460004535 + ... + 55460004556.

It is an arithmetic number, because the mean of its divisors is an integer number (332760027276).

Almost surely, 2^{1220120100001} is an apocalyptic number.

1220120100001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220120100001 is a deficient number, since it is larger than the sum of its proper divisors (110920009103).

1220120100001 is a wasteful number, since it uses less digits than its factorization.

1220120100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110920009102.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1220120100001 its reverse (1000010210221), we get a palindrome (2220130310222).

The spelling of 1220120100001 in words is "one trillion, two hundred twenty billion, one hundred twenty million, one hundred thousand, one".