1221224432240 has 40 divisors (see below), whose sum is σ = 2839439700240. Its totient is φ = 488473790976.

The previous prime is 1221224432237. The next prime is 1221224432279. The reversal of 1221224432240 is 422344221221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1221224432240² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2383196 + ... + 2849924.

It is an arithmetic number, because the mean of its divisors is an integer number (70985992506).

Almost surely, 2^{1221224432240} is an apocalyptic number.

1221224432240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221224432240 is an abundant number, since it is smaller than the sum of its proper divisors (1618215268000).

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

1221224432240 is a wasteful number, since it uses less digits than its factorization.

1221224432240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499449 (or 499443 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 1221224432240 its reverse (422344221221), we get a palindrome (1643568653461).

The spelling of 1221224432240 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-four million, four hundred thirty-two thousand, two hundred forty".