1221111026 has 16 divisors (see below), whose sum is σ = 1839511296. Its totient is φ = 607946496.

The previous prime is 1221111007. The next prime is 1221111029. The reversal of 1221111026 is 6201111221.

It is a super-2 number, since 2×1221111026² = 2982224275637545352, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221110995 and 1221111013.

It is not an unprimeable number, because it can be changed into a prime (1221111029) 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, 892595 + ... + 893961.

It is an arithmetic number, because the mean of its divisors is an integer number (114969456).

Almost surely, 2^1221111026 is an apocalyptic number.

1221111026 is a deficient number, since it is larger than the sum of its proper divisors (618400270).

1221111026 is a wasteful number, since it uses less digits than its factorization.

1221111026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 1221111026 is about 34944.3990648001. The cubic root of 1221111026 is about 1068.8539935696.

Adding to 1221111026 its reverse (6201111221), we get a palindrome (7422222247).

The spelling of 1221111026 in words is "one billion, two hundred twenty-one million, one hundred eleven thousand, twenty-six".