1221042650 has 24 divisors (see below), whose sum is σ = 2284283484. Its totient is φ = 485590400.

The previous prime is 1221042569. The next prime is 1221042679. The reversal of 1221042650 is 562401221.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 308458969 + 912583681 = 17563^2 + 30209^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61931 + ... + 79230.

Almost surely, 2^1221042650 is an apocalyptic number.

1221042650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221042650 is a deficient number, since it is larger than the sum of its proper divisors (1063240834).

1221042650 is a wasteful number, since it uses less digits than its factorization.

1221042650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141346 (or 141341 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1221042650 is about 34943.4206968923. The cubic root of 1221042650 is about 1068.8340430701.

Adding to 1221042650 its reverse (562401221), we get a palindrome (1783443871).

The spelling of 1221042650 in words is "one billion, two hundred twenty-one million, forty-two thousand, six hundred fifty".