1221766170 has 64 divisors (see below), whose sum is σ = 2969063424. Its totient is φ = 321735680.

The previous prime is 1221766163. The next prime is 1221766199. The reversal of 1221766170 is 716671221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1297900 + ... + 1298840.

It is an arithmetic number, because the mean of its divisors is an integer number (46391616).

Almost surely, 2^1221766170 is an apocalyptic number.

1221766170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221766170 is an abundant number, since it is smaller than the sum of its proper divisors (1747297254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221766170 is a wasteful number, since it uses less digits than its factorization.

1221766170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 1221766170 is about 34953.7718994674. The cubic root of 1221766170 is about 1069.0451113498.

It can be divided in two parts, 12217 and 66170, that added together give a palindrome (78387).

The spelling of 1221766170 in words is "one billion, two hundred twenty-one million, seven hundred sixty-six thousand, one hundred seventy".