1221288700 has 18 divisors (see below), whose sum is σ = 2650196696. Its totient is φ = 488515440.

The previous prime is 1221288697. The next prime is 1221288701. The reversal of 1221288700 is 78821221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221288701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6106344 + ... + 6106543.

Almost surely, 2^1221288700 is an apocalyptic number.

1221288700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221288700 is an abundant number, since it is smaller than the sum of its proper divisors (1428907996).

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

1221288700 is a wasteful number, since it uses less digits than its factorization.

1221288700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12212901 (or 12212894 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 1221288700 is about 34946.9412109272. The cubic root of 1221288700 is about 1068.9058311586.

The spelling of 1221288700 in words is "one billion, two hundred twenty-one million, two hundred eighty-eight thousand, seven hundred".