42920821634 has 8 divisors (see below), whose sum is σ = 64382284560. Its totient is φ = 21460060116.

The previous prime is 42920821631. The next prime is 42920821651. The reversal of 42920821634 is 43612802924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42920821591 and 42920821600.

It is not an unprimeable number, because it can be changed into a prime (42920821631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22097 + ... + 293819.

It is an arithmetic number, because the mean of its divisors is an integer number (8047785570).

Almost surely, 2^42920821634 is an apocalyptic number.

42920821634 is a deficient number, since it is larger than the sum of its proper divisors (21461462926).

42920821634 is a wasteful number, since it uses less digits than its factorization.

42920821634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350704.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 42920821634 in words is "forty-two billion, nine hundred twenty million, eight hundred twenty-one thousand, six hundred thirty-four".