642702142221 has 8 divisors (see below), whose sum is σ = 876864938400. Its totient is φ = 418503720432.

The previous prime is 642702142211. The next prime is 642702142237. The reversal of 642702142221 is 122241207246.

It is a happy number.

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

It is not a de Polignac number, because 642702142221 - 2²⁶ = 642635033357 is a prime.

It is a super-3 number, since 3×642702142221³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642702142211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2491093446 + ... + 2491093703.

It is an arithmetic number, because the mean of its divisors is an integer number (109608117300).

Almost surely, 2^642702142221 is an apocalyptic number.

It is an amenable number.

642702142221 is a deficient number, since it is larger than the sum of its proper divisors (234162796179).

642702142221 is a wasteful number, since it uses less digits than its factorization.

642702142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982187195.

The product of its (nonzero) digits is 21504, while the sum is 33.

Adding to 642702142221 its reverse (122241207246), we get a palindrome (764943349467).

The spelling of 642702142221 in words is "six hundred forty-two billion, seven hundred two million, one hundred forty-two thousand, two hundred twenty-one".