1221434004 has 48 divisors (see below), whose sum is σ = 3261910400. Its totient is φ = 348471936.

The previous prime is 1221433949. The next prime is 1221434033. The reversal of 1221434004 is 4004341221.

It is a super-2 number, since 2×1221434004² = 2983802052254944032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 49302 + ... + 69810.

Almost surely, 2^1221434004 is an apocalyptic number.

1221434004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1221434004 is an abundant number, since it is smaller than the sum of its proper divisors (2040476396).

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

1221434004 is a wasteful number, since it uses less digits than its factorization.

1221434004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21232 (or 21230 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1221434004 is about 34949.0200720993. The cubic root of 1221434004 is about 1068.9482208446.

Adding to 1221434004 its reverse (4004341221), we get a palindrome (5225775225).

The spelling of 1221434004 in words is "one billion, two hundred twenty-one million, four hundred thirty-four thousand, four".