1221440234 has 32 divisors (see below), whose sum is σ = 2130347520. Its totient is φ = 514415232.

The previous prime is 1221440197. The next prime is 1221440239. The reversal of 1221440234 is 4320441221.

It is not an unprimeable number, because it can be changed into a prime (1221440239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297407 + ... + 301485.

It is an arithmetic number, because the mean of its divisors is an integer number (66573360).

Almost surely, 2^1221440234 is an apocalyptic number.

1221440234 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1221440234 is a deficient number, since it is larger than the sum of its proper divisors (908907286).

1221440234 is a wasteful number, since it uses less digits than its factorization.

1221440234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4454.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1221440234 is about 34949.1092018094. The cubic root of 1221440234 is about 1068.9500382538.

Adding to 1221440234 its reverse (4320441221), we get a palindrome (5541881455).

The spelling of 1221440234 in words is "one billion, two hundred twenty-one million, four hundred forty thousand, two hundred thirty-four".