1221708474 has 144 divisors (see below), whose sum is σ = 3335731200. Its totient is φ = 330429456.

The previous prime is 1221708461. The next prime is 1221708497. The reversal of 1221708474 is 4748071221.

1221708474 is a `hidden beast` number, since 12 + 2 + 170 + 8 + 474 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 954567 + ... + 955845.

It is an arithmetic number, because the mean of its divisors is an integer number (23164800).

Almost surely, 2^1221708474 is an apocalyptic number.

1221708474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221708474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1667865600).

1221708474 is an abundant number, since it is smaller than the sum of its proper divisors (2114022726).

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

1221708474 is a wasteful number, since it uses less digits than its factorization.

1221708474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1310 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 1221708474 is about 34952.9465710689. The cubic root of 1221708474 is about 1069.0282830894.

Adding to 1221708474 its reverse (4748071221), we get a palindrome (5969779695).

The spelling of 1221708474 in words is "one billion, two hundred twenty-one million, seven hundred eight thousand, four hundred seventy-four".