1220121011 has 8 divisors (see below), whose sum is σ = 1230888960. Its totient is φ = 1209381768.

The previous prime is 1220120989. The next prime is 1220121017. The reversal of 1220121011 is 1101210221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220121011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220120983 and 1220121001.

It is not an unprimeable number, because it can be changed into a prime (1220121017) 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, 83150 + ... + 96716.

It is an arithmetic number, because the mean of its divisors is an integer number (153861120).

Almost surely, 2^1220121011 is an apocalyptic number.

1220121011 is a deficient number, since it is larger than the sum of its proper divisors (10767949).

1220121011 is a wasteful number, since it uses less digits than its factorization.

1220121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14353.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1220121011 is about 34930.2306176183. The cubic root of 1220121011 is about 1068.5650579019.

Adding to 1220121011 its reverse (1101210221), we get a palindrome (2321331232).

The spelling of 1220121011 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, eleven".