1220443145511 has 16 divisors (see below), whose sum is σ = 1698127146240. Its totient is φ = 778198924800.

The previous prime is 1220443145501. The next prime is 1220443145561. The reversal of 1220443145511 is 1155413440221.

It is not a de Polignac number, because 1220443145511 - 2¹⁴ = 1220443129127 is a prime.

It is a super-2 number, since 2×1220443145511² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220443145501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379560 + ... + 1607778.

It is an arithmetic number, because the mean of its divisors is an integer number (106132946640).

Almost surely, 2^{1220443145511} is an apocalyptic number.

1220443145511 is a deficient number, since it is larger than the sum of its proper divisors (477684000729).

1220443145511 is a wasteful number, since it uses less digits than its factorization.

1220443145511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242646.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 1220443145511 its reverse (1155413440221), we get a palindrome (2375856585732).

The spelling of 1220443145511 in words is "one trillion, two hundred twenty billion, four hundred forty-three million, one hundred forty-five thousand, five hundred eleven".