1228321378851 has 32 divisors (see below), whose sum is σ = 1879101504000. Its totient is φ = 699133958400.

The previous prime is 1228321378829. The next prime is 1228321378859. The reversal of 1228321378851 is 1588731238221.

It is not a de Polignac number, because 1228321378851 - 2⁵ = 1228321378819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1228321378794 and 1228321378803.

It is not an unprimeable number, because it can be changed into a prime (1228321378859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28511575 + ... + 28554623.

It is an arithmetic number, because the mean of its divisors is an integer number (58721922000).

Almost surely, 2^{1228321378851} is an apocalyptic number.

1228321378851 is a deficient number, since it is larger than the sum of its proper divisors (650780125149).

1228321378851 is a wasteful number, since it uses less digits than its factorization.

1228321378851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48379.

The product of its digits is 1290240, while the sum is 51.

The spelling of 1228321378851 in words is "one trillion, two hundred twenty-eight billion, three hundred twenty-one million, three hundred seventy-eight thousand, eight hundred fifty-one".