1221244400100 has 36 divisors (see below), whose sum is σ = 3533467131824. Its totient is φ = 325665173280.

The previous prime is 1221244400017. The next prime is 1221244400213. The reversal of 1221244400100 is 10044421221.

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, 2035407034 + ... + 2035407633.

Almost surely, 2^{1221244400100} is an apocalyptic number.

1221244400100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221244400100 is an abundant number, since it is smaller than the sum of its proper divisors (2312222731724).

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

1221244400100 is a wasteful number, since it uses less digits than its factorization.

1221244400100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4070814684 (or 4070814677 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 1221244400100 its reverse (10044421221), we get a palindrome (1231288821321).

The spelling of 1221244400100 in words is "one trillion, two hundred twenty-one billion, two hundred forty-four million, four hundred thousand, one hundred".