40144121820 has 72 divisors (see below), whose sum is σ = 132840555120. Its totient is φ = 9731907840.

The previous prime is 40144121807. The next prime is 40144121837. The reversal of 40144121820 is 2812144104.

40144121820 is a `hidden beast` number, since 4 + 0 + 1 + 441 + 218 + 2 + 0 = 666.

It is a super-2 number, since 2×40144121820² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10135425 + ... + 10139384.

It is an arithmetic number, because the mean of its divisors is an integer number (1845007710).

Almost surely, 2^40144121820 is an apocalyptic number.

It is an amenable number.

40144121820 is an abundant number, since it is smaller than the sum of its proper divisors (92696433300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40144121820 is a wasteful number, since it uses less digits than its factorization.

40144121820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20274835 (or 20274830 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

Adding to 40144121820 its reverse (2812144104), we get a palindrome (42956265924).

The spelling of 40144121820 in words is "forty billion, one hundred forty-four million, one hundred twenty-one thousand, eight hundred twenty".