72421351 has 4 divisors (see below), whose sum is σ = 72950112. Its totient is φ = 71892592.

The previous prime is 72421333. The next prime is 72421357. The reversal of 72421351 is 15312427.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72421351 - 2⁹ = 72420839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72421357) 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, 264175 + ... + 264448.

It is an arithmetic number, because the mean of its divisors is an integer number (18237528).

Almost surely, 2^72421351 is an apocalyptic number.

72421351 is a deficient number, since it is larger than the sum of its proper divisors (528761).

72421351 is a wasteful number, since it uses less digits than its factorization.

72421351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528760.

The product of its digits is 1680, while the sum is 25.

The square root of 72421351 is about 8510.0735014452. The cubic root of 72421351 is about 416.8267102165.

Adding to 72421351 its reverse (15312427), we get a palindrome (87733778).

The spelling of 72421351 in words is "seventy-two million, four hundred twenty-one thousand, three hundred fifty-one".