1221100250530 has 8 divisors (see below), whose sum is σ = 2197980450972. Its totient is φ = 488440100208.

The previous prime is 1221100250509. The next prime is 1221100250549. The reversal of 1221100250530 is 350520011221.

It can be written as a sum of positive squares in 2 ways, for example, as 1172934486441 + 48165764089 = 1083021^2 + 219467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61055012517 + ... + 61055012536.

Almost surely, 2^{1221100250530} is an apocalyptic number.

1221100250530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221100250530 is a deficient number, since it is larger than the sum of its proper divisors (976880200442).

1221100250530 is a wasteful number, since it uses less digits than its factorization.

1221100250530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122110025060.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 1221100250530 its reverse (350520011221), we get a palindrome (1571620261751).

The spelling of 1221100250530 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred fifty thousand, five hundred thirty".