1221025830413 has 4 divisors (see below), whose sum is σ = 1232437286880. Its totient is φ = 1209614373948.

The previous prime is 1221025830379. The next prime is 1221025830443. The reversal of 1221025830413 is 3140385201221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221025830413 - 2¹⁰ = 1221025829389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221025830413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221025830443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5705728073 + ... + 5705728286.

It is an arithmetic number, because the mean of its divisors is an integer number (308109321720).

Almost surely, 2^{1221025830413} is an apocalyptic number.

It is an amenable number.

1221025830413 is a deficient number, since it is larger than the sum of its proper divisors (11411456467).

1221025830413 is a wasteful number, since it uses less digits than its factorization.

1221025830413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11411456466.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 1221025830413 in words is "one trillion, two hundred twenty-one billion, twenty-five million, eight hundred thirty thousand, four hundred thirteen".