1221400243330 has 64 divisors (see below), whose sum is σ = 2319733404000. Its totient is φ = 462315642880.

The previous prime is 1221400243279. The next prime is 1221400243331. The reversal of 1221400243330 is 333420041221.

It can be written as a sum of positive squares in 16 ways, for example, as 77969951361 + 1143430291969 = 279231^2 + 1069313^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221400243295 and 1221400243304.

It is not an unprimeable number, because it can be changed into a prime (1221400243331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14420946 + ... + 14505394.

Almost surely, 2^{1221400243330} is an apocalyptic number.

1221400243330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221400243330 is a deficient number, since it is larger than the sum of its proper divisors (1098333160670).

1221400243330 is a wasteful number, since it uses less digits than its factorization.

1221400243330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85479.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 1221400243330 its reverse (333420041221), we get a palindrome (1554820284551).

The spelling of 1221400243330 in words is "one trillion, two hundred twenty-one billion, four hundred million, two hundred forty-three thousand, three hundred thirty".