1221404046 has 32 divisors (see below), whose sum is σ = 2470169088. Its totient is φ = 402598080.

The previous prime is 1221404033. The next prime is 1221404057. The reversal of 1221404046 is 6404041221.

It is a happy number.

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, 220021 + ... + 225503.

It is an arithmetic number, because the mean of its divisors is an integer number (77192784).

Almost surely, 2^1221404046 is an apocalyptic number.

1221404046 is an abundant number, since it is smaller than the sum of its proper divisors (1248765042).

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

1221404046 is a wasteful number, since it uses less digits than its factorization.

1221404046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 1221404046 is about 34948.5914737633. The cubic root of 1221404046 is about 1068.9394814415.

Adding to 1221404046 its reverse (6404041221), we get a palindrome (7625445267).

The spelling of 1221404046 in words is "one billion, two hundred twenty-one million, four hundred four thousand, forty-six".