40021121420 has 144 divisors (see below), whose sum is σ = 99370343520. Its totient is φ = 13497394176.

The previous prime is 40021121419. The next prime is 40021121423. The reversal of 40021121420 is 2412112004.

It is not an unprimeable number, because it can be changed into a prime (40021121423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52867682 + ... + 52868438.

It is an arithmetic number, because the mean of its divisors is an integer number (690071830).

Almost surely, 2^40021121420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40021121420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49685171760).

40021121420 is an abundant number, since it is smaller than the sum of its proper divisors (59349222100).

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

40021121420 is a wasteful number, since it uses less digits than its factorization.

40021121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592 (or 1583 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 40021121420 its reverse (2412112004), we get a palindrome (42433233424).

The spelling of 40021121420 in words is "forty billion, twenty-one million, one hundred twenty-one thousand, four hundred twenty".