1221523213410 has 24 divisors (see below), whose sum is σ = 3175960355100. Its totient is φ = 325739523552.

The previous prime is 1221523213363. The next prime is 1221523213423. The reversal of 1221523213410 is 143123251221.

It is a happy number.

1221523213410 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 5 + 232 + 13 + 410 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1211626346121 + 9896867289 = 1100739^2 + 99483^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6786239985 + ... + 6786240164.

Almost surely, 2^{1221523213410} is an apocalyptic number.

1221523213410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221523213410 is an abundant number, since it is smaller than the sum of its proper divisors (1954437141690).

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

1221523213410 is a wasteful number, since it uses less digits than its factorization.

1221523213410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13572480162 (or 13572480159 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 1221523213410 its reverse (143123251221), we get a palindrome (1364646464631).

The spelling of 1221523213410 in words is "one trillion, two hundred twenty-one billion, five hundred twenty-three million, two hundred thirteen thousand, four hundred ten".