1221341760 has 112 divisors (see below), whose sum is σ = 4308652800. Its totient is φ = 325688832.

The previous prime is 1221341747. The next prime is 1221341783. The reversal of 1221341760 is 671431221.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 62040 + ... + 79319.

Almost surely, 2^1221341760 is an apocalyptic number.

1221341760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221341760 is an abundant number, since it is smaller than the sum of its proper divisors (3087311040).

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

1221341760 is a wasteful number, since it uses less digits than its factorization.

1221341760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141385 (or 141369 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1221341760 is about 34947.7003535283. The cubic root of 1221341760 is about 1068.9213107969.

Adding to 1221341760 its reverse (671431221), we get a palindrome (1892772981).

The spelling of 1221341760 in words is "one billion, two hundred twenty-one million, three hundred forty-one thousand, seven hundred sixty".