1221618046 has 32 divisors (see below), whose sum is σ = 2056513536. Its totient is φ = 539448000.

The previous prime is 1221618019. The next prime is 1221618061. The reversal of 1221618046 is 6408161221.

It is a junction number, because it is equal to n+sod(n) for n = 1221617999 and 1221618017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177306 + ... + 184066.

It is an arithmetic number, because the mean of its divisors is an integer number (64266048).

Almost surely, 2^1221618046 is an apocalyptic number.

1221618046 is a deficient number, since it is larger than the sum of its proper divisors (834895490).

1221618046 is a wasteful number, since it uses less digits than its factorization.

1221618046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7008.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1221618046 is about 34951.6529795087. The cubic root of 1221618046 is about 1069.0019067820.

Adding to 1221618046 its reverse (6408161221), we get a palindrome (7629779267).

The spelling of 1221618046 in words is "one billion, two hundred twenty-one million, six hundred eighteen thousand, forty-six".