1221222885 has 8 divisors (see below), whose sum is σ = 1953956640. Its totient is φ = 651318864.

The previous prime is 1221222883. The next prime is 1221222889. The reversal of 1221222885 is 5882221221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221222885 - 2¹ = 1221222883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222883) 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, 40707415 + ... + 40707444.

It is an arithmetic number, because the mean of its divisors is an integer number (244244580).

Almost surely, 2^1221222885 is an apocalyptic number.

1221222885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221222885 is a deficient number, since it is larger than the sum of its proper divisors (732733755).

1221222885 is an equidigital number, since it uses as much as digits as its factorization.

1221222885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81414867.

The product of its digits is 10240, while the sum is 33.

The square root of 1221222885 is about 34945.9995564585. Note that the first 3 decimals coincide. The cubic root of 1221222885 is about 1068.8866297743.

The spelling of 1221222885 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, eight hundred eighty-five".