43221620121 has 4 divisors (see below), whose sum is σ = 57628826832. Its totient is φ = 28814413412.

The previous prime is 43221620119. The next prime is 43221620207. The reversal of 43221620121 is 12102612234.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43221620121 - 2¹ = 43221620119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43221620091 and 43221620100.

It is not an unprimeable number, because it can be changed into a prime (43221620021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7203603351 + ... + 7203603356.

It is an arithmetic number, because the mean of its divisors is an integer number (14407206708).

Almost surely, 2^43221620121 is an apocalyptic number.

It is an amenable number.

43221620121 is a deficient number, since it is larger than the sum of its proper divisors (14407206711).

43221620121 is a wasteful number, since it uses less digits than its factorization.

43221620121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14407206710.

The product of its (nonzero) digits is 1152, while the sum is 24.

The spelling of 43221620121 in words is "forty-three billion, two hundred twenty-one million, six hundred twenty thousand, one hundred twenty-one".