43722121 has 8 divisors (see below), whose sum is σ = 45279488. Its totient is φ = 42174000.

The previous prime is 43722101. The next prime is 43722139. The reversal of 43722121 is 12122734.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43722121 - 2²¹ = 41624969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43722092 and 43722101.

It is not an unprimeable number, because it can be changed into a prime (43722101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8131 + ... + 12391.

It is an arithmetic number, because the mean of its divisors is an integer number (5659936).

Almost surely, 2^43722121 is an apocalyptic number.

It is an amenable number.

43722121 is a deficient number, since it is larger than the sum of its proper divisors (1557367).

43722121 is a wasteful number, since it uses less digits than its factorization.

43722121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623.

The product of its digits is 672, while the sum is 22.

The square root of 43722121 is about 6612.2704875103. The cubic root of 43722121 is about 352.2900743598.

Adding to 43722121 its reverse (12122734), we get a palindrome (55844855).

The spelling of 43722121 in words is "forty-three million, seven hundred twenty-two thousand, one hundred twenty-one".