72052121 has 4 divisors (see below), whose sum is σ = 72260112. Its totient is φ = 71844132.

The previous prime is 72052117. The next prime is 72052139. The reversal of 72052121 is 12125027.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12125027 = 2213 ⋅5479.

It is a cyclic number.

It is not a de Polignac number, because 72052121 - 2² = 72052117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72052093 and 72052102.

It is not an unprimeable number, because it can be changed into a prime (72052151) 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, 103475 + ... + 104168.

It is an arithmetic number, because the mean of its divisors is an integer number (18065028).

Almost surely, 2^72052121 is an apocalyptic number.

It is an amenable number.

72052121 is a deficient number, since it is larger than the sum of its proper divisors (207991).

72052121 is a wasteful number, since it uses less digits than its factorization.

72052121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207990.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 72052121 is about 8488.3520779949. The cubic root of 72052121 is about 416.1171256276.

Adding to 72052121 its reverse (12125027), we get a palindrome (84177148).

The spelling of 72052121 in words is "seventy-two million, fifty-two thousand, one hundred twenty-one".