1251530211205 has 16 divisors (see below), whose sum is σ = 1503345614400. Its totient is φ = 1000218447360.

The previous prime is 1251530211203. The next prime is 1251530211229. The reversal of 1251530211205 is 5021120351521.

It is a happy number.

It is not a de Polignac number, because 1251530211205 - 2¹ = 1251530211203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251530211203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20550250 + ... + 20611060.

It is an arithmetic number, because the mean of its divisors is an integer number (93959100900).

Almost surely, 2^{1251530211205} is an apocalyptic number.

It is an amenable number.

1251530211205 is a deficient number, since it is larger than the sum of its proper divisors (251815403195).

1251530211205 is a wasteful number, since it uses less digits than its factorization.

1251530211205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64884.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 1251530211205 its reverse (5021120351521), we get a palindrome (6272650562726).

The spelling of 1251530211205 in words is "one trillion, two hundred fifty-one billion, five hundred thirty million, two hundred eleven thousand, two hundred five".