142421771644 has 24 divisors (see below), whose sum is σ = 252469002240. Its totient is φ = 70288314096.

The previous prime is 142421771599. The next prime is 142421771747. The reversal of 142421771644 is 446177124241.

It is a super-2 number, since 2×142421771644² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 142421771644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010469 + ... + 1142755.

It is an arithmetic number, because the mean of its divisors is an integer number (10519541760).

Almost surely, 2^142421771644 is an apocalyptic number.

It is an amenable number.

142421771644 is a deficient number, since it is larger than the sum of its proper divisors (110047230596).

142421771644 is a wasteful number, since it uses less digits than its factorization.

142421771644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135777 (or 135775 counting only the distinct ones).

The product of its digits is 301056, while the sum is 43.

Adding to 142421771644 its reverse (446177124241), we get a palindrome (588598895885).

The spelling of 142421771644 in words is "one hundred forty-two billion, four hundred twenty-one million, seven hundred seventy-one thousand, six hundred forty-four".