20120101101 has 6 divisors (see below), whose sum is σ = 29062368270. Its totient is φ = 13413400728.

The previous prime is 20120101051. The next prime is 20120101109. The reversal of 20120101101 is 10110102102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13259292201 + 6860808900 = 115149^2 + 82830^2 .

It is not a de Polignac number, because 20120101101 - 2⁶ = 20120101037 is a prime.

It is a super-2 number, since 2×20120101101² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2235566789 = 20120101101 / (2 + 0 + 1 + 2 + 0 + 1 + 0 + 1 + 1 + 0 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120101109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117783386 + ... + 1117783403.

It is an arithmetic number, because the mean of its divisors is an integer number (4843728045).

Almost surely, 2^20120101101 is an apocalyptic number.

It is an amenable number.

20120101101 is a deficient number, since it is larger than the sum of its proper divisors (8942267169).

20120101101 is a wasteful number, since it uses less digits than its factorization.

20120101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235566795 (or 2235566792 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20120101101 its reverse (10110102102), we get a palindrome (30230203203).

The spelling of 20120101101 in words is "twenty billion, one hundred twenty million, one hundred one thousand, one hundred one".