1221111254 has 16 divisors (see below), whose sum is σ = 2000835216. Its totient is φ = 554313600.

The previous prime is 1221111253. The next prime is 1221111271. The reversal of 1221111254 is 4521111221.

It is a super-2 number, since 2×1221111254² = 2982225389290905032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221111253) 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, 19727 + ... + 53210.

It is an arithmetic number, because the mean of its divisors is an integer number (125052201).

Almost surely, 2^1221111254 is an apocalyptic number.

1221111254 is a deficient number, since it is larger than the sum of its proper divisors (779723962).

1221111254 is a wasteful number, since it uses less digits than its factorization.

1221111254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73711.

The product of its digits is 160, while the sum is 20.

The square root of 1221111254 is about 34944.4023271253. The cubic root of 1221111254 is about 1068.8540600933.

Adding to 1221111254 its reverse (4521111221), we get a palindrome (5742222475).

The spelling of 1221111254 in words is "one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred fifty-four".