1213257034138 has 4 divisors (see below), whose sum is σ = 1819885551210. Its totient is φ = 606628517068.

The previous prime is 1213257034117. The next prime is 1213257034141. The reversal of 1213257034138 is 8314307523121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 760256693329 + 453000340809 = 871927^2 + 673053^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1213257034138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303314258533 + ... + 303314258536.

Almost surely, 2^{1213257034138} is an apocalyptic number.

1213257034138 is a deficient number, since it is larger than the sum of its proper divisors (606628517072).

1213257034138 is an equidigital number, since it uses as much as digits as its factorization.

1213257034138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606628517071.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 1213257034138 in words is "one trillion, two hundred thirteen billion, two hundred fifty-seven million, thirty-four thousand, one hundred thirty-eight".