1221453200 has 60 divisors (see below), whose sum is σ = 3201329328. Its totient is φ = 444163200.

The previous prime is 1221453199. The next prime is 1221453217. The reversal of 1221453200 is 23541221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134402 + ... + 143201.

Almost surely, 2^1221453200 is an apocalyptic number.

1221453200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221453200 is an abundant number, since it is smaller than the sum of its proper divisors (1979876128).

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

1221453200 is a wasteful number, since it uses less digits than its factorization.

1221453200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277632 (or 277621 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1221453200 is about 34949.2946996073. The cubic root of 1221453200 is about 1068.9538206621.

Adding to 1221453200 its reverse (23541221), we get a palindrome (1244994421).

The spelling of 1221453200 in words is "one billion, two hundred twenty-one million, four hundred fifty-three thousand, two hundred".