1221106479 has 16 divisors (see below), whose sum is σ = 1656498144. Its totient is φ = 799920000.

The previous prime is 1221106457. The next prime is 1221106489. The reversal of 1221106479 is 9746011221.

It is a happy number.

It is not a de Polignac number, because 1221106479 - 2²⁴ = 1204329263 is a prime.

It is a super-2 number, since 2×1221106479² = 2982202066111554882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221106489) 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, 219229 + ... + 224729.

It is an arithmetic number, because the mean of its divisors is an integer number (103531134).

Almost surely, 2^1221106479 is an apocalyptic number.

1221106479 is a deficient number, since it is larger than the sum of its proper divisors (435391665).

1221106479 is a wasteful number, since it uses less digits than its factorization.

1221106479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6778.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1221106479 is about 34944.3340042417. The cubic root of 1221106479 is about 1068.8526668856.

The spelling of 1221106479 in words is "one billion, two hundred twenty-one million, one hundred six thousand, four hundred seventy-nine".