1220120101 has 4 divisors (see below), whose sum is σ = 1220272672. Its totient is φ = 1219967532.

The previous prime is 1220120089. The next prime is 1220120113. The reversal of 1220120101 is 1010210221.

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 an interprime number because it is at equal distance from previous prime (1220120089) and next prime (1220120113).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220120101 is a prime.

It is a super-3 number, since 3×1220120101³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120201) 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, 63585 + ... + 80518.

It is an arithmetic number, because the mean of its divisors is an integer number (305068168).

Almost surely, 2^1220120101 is an apocalyptic number.

It is an amenable number.

1220120101 is a deficient number, since it is larger than the sum of its proper divisors (152571).

1220120101 is an equidigital number, since it uses as much as digits as its factorization.

1220120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152570.

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

The square root of 1220120101 is about 34930.2175916498. The cubic root of 1220120101 is about 1068.5647922468.

Adding to 1220120101 its reverse (1010210221), we get a palindrome (2230330322).

It can be divided in two parts, 1220120 and 101, that added together give a palindrome (1220221).

The spelling of 1220120101 in words is "one billion, two hundred twenty million, one hundred twenty thousand, one hundred one".