1221814650 has 96 divisors (see below), whose sum is σ = 3666729600. Its totient is φ = 262840320.

The previous prime is 1221814597. The next prime is 1221814669. The reversal of 1221814650 is 564181221.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16375 + ... + 52074.

It is an arithmetic number, because the mean of its divisors is an integer number (38195100).

Almost surely, 2^1221814650 is an apocalyptic number.

1221814650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221814650 is an abundant number, since it is smaller than the sum of its proper divisors (2444914950).

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

1221814650 is a wasteful number, since it uses less digits than its factorization.

1221814650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68488 (or 68483 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1221814650 is about 34954.4653799768. The cubic root of 1221814650 is about 1069.0592511590.

Adding to 1221814650 its reverse (564181221), we get a palindrome (1785995871).

The spelling of 1221814650 in words is "one billion, two hundred twenty-one million, eight hundred fourteen thousand, six hundred fifty".