642021546223 has 4 divisors (see below), whose sum is σ = 657680608368. Its totient is φ = 626362484080.

The previous prime is 642021546211. The next prime is 642021546251. The reversal of 642021546223 is 322645120246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322645120246 = 2 ⋅161322560123.

It is a cyclic number.

It is not a de Polignac number, because 642021546223 - 2⁵ = 642021546191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642021546323) 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, 7829531011 + ... + 7829531092.

It is an arithmetic number, because the mean of its divisors is an integer number (164420152092).

Almost surely, 2^642021546223 is an apocalyptic number.

642021546223 is a deficient number, since it is larger than the sum of its proper divisors (15659062145).

642021546223 is a wasteful number, since it uses less digits than its factorization.

642021546223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15659062144.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 642021546223 its reverse (322645120246), we get a palindrome (964666666469).

The spelling of 642021546223 in words is "six hundred forty-two billion, twenty-one million, five hundred forty-six thousand, two hundred twenty-three".