1221241420 has 48 divisors (see below), whose sum is σ = 2993356800. Its totient is φ = 409800384.

The previous prime is 1221241403. The next prime is 1221241433. The reversal of 1221241420 is 241421221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86220 + ... + 99379.

It is an arithmetic number, because the mean of its divisors is an integer number (62361600).

Almost surely, 2^1221241420 is an apocalyptic number.

1221241420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221241420 is an abundant number, since it is smaller than the sum of its proper divisors (1772115380).

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

1221241420 is a wasteful number, since it uses less digits than its factorization.

1221241420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185662 (or 185660 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1221241420 is about 34946.2647503278. The cubic root of 1221241420 is about 1068.8920373904.

Adding to 1221241420 its reverse (241421221), we get a palindrome (1462662641).

The spelling of 1221241420 in words is "one billion, two hundred twenty-one million, two hundred forty-one thousand, four hundred twenty".