1220011011231 has 16 divisors (see below), whose sum is σ = 1639141054464. Its totient is φ = 807115068864.

The previous prime is 1220011011227. The next prime is 1220011011341. The reversal of 1220011011231 is 1321101100221.

It is not a de Polignac number, because 1220011011231 - 2² = 1220011011227 is a prime.

It is a super-2 number, since 2×1220011011231² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220011011231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220011011221) 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, 622530 + ... + 1681536.

It is an arithmetic number, because the mean of its divisors is an integer number (102446315904).

Almost surely, 2^{1220011011231} is an apocalyptic number.

1220011011231 is a deficient number, since it is larger than the sum of its proper divisors (419130043233).

1220011011231 is a wasteful number, since it uses less digits than its factorization.

1220011011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061950.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1220011011231 its reverse (1321101100221), we get a palindrome (2541112111452).

The spelling of 1220011011231 in words is "one trillion, two hundred twenty billion, eleven million, eleven thousand, two hundred thirty-one".