42028894692821 has 4 divisors (see below), whose sum is σ = 43006310848512. Its totient is φ = 41051478537132.

The previous prime is 42028894692817. The next prime is 42028894692847. The reversal of 42028894692821 is 12829649882024.

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 42028894692821 - 2² = 42028894692817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42028894592821) 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, 488708077781 + ... + 488708077866.

It is an arithmetic number, because the mean of its divisors is an integer number (10751577712128).

Almost surely, 2^{42028894692821} is an apocalyptic number.

It is an amenable number.

42028894692821 is a deficient number, since it is larger than the sum of its proper divisors (977416155691).

42028894692821 is an equidigital number, since it uses as much as digits as its factorization.

42028894692821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977416155690.

The product of its (nonzero) digits is 63700992, while the sum is 65.

The spelling of 42028894692821 in words is "forty-two trillion, twenty-eight billion, eight hundred ninety-four million, six hundred ninety-two thousand, eight hundred twenty-one".