1245034211221 has 4 divisors (see below), whose sum is σ = 1299166133472. Its totient is φ = 1190902288972.

The previous prime is 1245034211207. The next prime is 1245034211237. The reversal of 1245034211221 is 1221124305421.

It is a happy number.

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 1245034211221 - 2¹³ = 1245034203029 is a prime.

It is a super-2 number, since 2×1245034211221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1245034211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245034211821) 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, 27065961091 + ... + 27065961136.

It is an arithmetic number, because the mean of its divisors is an integer number (324791533368).

Almost surely, 2^{1245034211221} is an apocalyptic number.

It is an amenable number.

1245034211221 is a deficient number, since it is larger than the sum of its proper divisors (54131922251).

1245034211221 is an equidigital number, since it uses as much as digits as its factorization.

1245034211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54131922250.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 1245034211221 its reverse (1221124305421), we get a palindrome (2466158516642).

The spelling of 1245034211221 in words is "one trillion, two hundred forty-five billion, thirty-four million, two hundred eleven thousand, two hundred twenty-one".