1220001001011 has 12 divisors (see below), whose sum is σ = 1897779335088. Its totient is φ = 750769846704.

The previous prime is 1220001000989. The next prime is 1220001001027. The reversal of 1220001001011 is 1101001000221.

It is a happy number.

It is not a de Polignac number, because 1220001001011 - 2¹¹ = 1220000998963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1220001000984 and 1220001001002.

It is not an unprimeable number, because it can be changed into a prime (1220001001091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5213679375 + ... + 5213679608.

It is an arithmetic number, because the mean of its divisors is an integer number (158148277924).

Almost surely, 2^{1220001001011} is an apocalyptic number.

1220001001011 is a deficient number, since it is larger than the sum of its proper divisors (677778334077).

1220001001011 is a wasteful number, since it uses less digits than its factorization.

1220001001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10427359002 (or 10427358999 counting only the distinct ones).

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

Adding to 1220001001011 its reverse (1101001000221), we get a palindrome (2321002001232).

The spelling of 1220001001011 in words is "one trillion, two hundred twenty billion, one million, one thousand, eleven".