72342121 has 4 divisors (see below), whose sum is σ = 72911872. Its totient is φ = 71772372.

The previous prime is 72342119. The next prime is 72342161. The reversal of 72342121 is 12124327.

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 72342121 - 2¹ = 72342119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72342092 and 72342101.

It is not an unprimeable number, because it can be changed into a prime (72342161) 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, 284685 + ... + 284938.

It is an arithmetic number, because the mean of its divisors is an integer number (18227968).

Almost surely, 2^72342121 is an apocalyptic number.

It is an amenable number.

72342121 is a deficient number, since it is larger than the sum of its proper divisors (569751).

72342121 is a wasteful number, since it uses less digits than its factorization.

72342121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569750.

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

The square root of 72342121 is about 8505.4171561423. The cubic root of 72342121 is about 416.6746499448.

Adding to 72342121 its reverse (12124327), we get a palindrome (84466448).

The spelling of 72342121 in words is "seventy-two million, three hundred forty-two thousand, one hundred twenty-one".