1378141221251 has 4 divisors (see below), whose sum is σ = 1378424153904. Its totient is φ = 1377858288600.

The previous prime is 1378141221199. The next prime is 1378141221283. The reversal of 1378141221251 is 1521221418731.

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

It is a cyclic number.

It is not a de Polignac number, because 1378141221251 - 2⁶ = 1378141221187 is a prime.

It is a super-2 number, since 2×1378141221251² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378141221151) 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, 141459020 + ... + 141468761.

It is an arithmetic number, because the mean of its divisors is an integer number (344606038476).

Almost surely, 2^{1378141221251} is an apocalyptic number.

1378141221251 is a deficient number, since it is larger than the sum of its proper divisors (282932653).

1378141221251 is an equidigital number, since it uses as much as digits as its factorization.

1378141221251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282932652.

The product of its digits is 26880, while the sum is 38.

Adding to 1378141221251 its reverse (1521221418731), we get a palindrome (2899362639982).

The spelling of 1378141221251 in words is "one trillion, three hundred seventy-eight billion, one hundred forty-one million, two hundred twenty-one thousand, two hundred fifty-one".