43721121420 has 36 divisors (see below), whose sum is σ = 132620735520. Its totient is φ = 11658965664.

The previous prime is 43721121419. The next prime is 43721121439. The reversal of 43721121420 is 2412112734.

43721121420 is a `hidden beast` number, since 4 + 3 + 7 + 211 + 21 + 420 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121447380 + ... + 121447739.

It is an arithmetic number, because the mean of its divisors is an integer number (3683909320).

Almost surely, 2^43721121420 is an apocalyptic number.

It is an amenable number.

43721121420 is an abundant number, since it is smaller than the sum of its proper divisors (88899614100).

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

43721121420 is a wasteful number, since it uses less digits than its factorization.

43721121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242895134 (or 242895129 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The spelling of 43721121420 in words is "forty-three billion, seven hundred twenty-one million, one hundred twenty-one thousand, four hundred twenty".