1221367896 has 240 divisors, whose sum is σ = 4095075600. Its totient is φ = 333134208.

The previous prime is 1221367831. The next prime is 1221367913. The reversal of 1221367896 is 6987631221.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2399290 + ... + 2399798.

It is an arithmetic number, because the mean of its divisors is an integer number (17062815).

Almost surely, 2^1221367896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221367896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2047537800).

1221367896 is an abundant number, since it is smaller than the sum of its proper divisors (2873707704).

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

1221367896 is a wasteful number, since it uses less digits than its factorization.

1221367896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 544 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1221367896 is about 34948.0742817111. The cubic root of 1221367896 is about 1068.9289355063.

The spelling of 1221367896 in words is "one billion, two hundred twenty-one million, three hundred sixty-seven thousand, eight hundred ninety-six".