1221144231410 has 32 divisors (see below), whose sum is σ = 2231068538160. Its totient is φ = 481139785728.

The previous prime is 1221144231407. The next prime is 1221144231449. The reversal of 1221144231410 is 141324411221.

It can be written as a sum of positive squares in 8 ways, for example, as 312723653089 + 908420578321 = 559217^2 + 953111^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221144231410.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526277 + ... + 1649016.

Almost surely, 2^{1221144231410} is an apocalyptic number.

1221144231410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221144231410 is a deficient number, since it is larger than the sum of its proper divisors (1009924306750).

1221144231410 is a wasteful number, since it uses less digits than its factorization.

1221144231410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176142.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 1221144231410 its reverse (141324411221), we get a palindrome (1362468642631).

The spelling of 1221144231410 in words is "one trillion, two hundred twenty-one billion, one hundred forty-four million, two hundred thirty-one thousand, four hundred ten".