72300021 has 8 divisors (see below), whose sum is σ = 96542304. Its totient is φ = 48128880.

The previous prime is 72299993. The next prime is 72300023. The reversal of 72300021 is 12000327.

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

It is not a de Polignac number, because 72300021 - 2⁵ = 72299989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72300023) 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, 15366 + ... + 19511.

It is an arithmetic number, because the mean of its divisors is an integer number (12067788).

Almost surely, 2^72300021 is an apocalyptic number.

It is an amenable number.

72300021 is a deficient number, since it is larger than the sum of its proper divisors (24242283).

72300021 is a wasteful number, since it uses less digits than its factorization.

72300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35571.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 72300021 is about 8502.9419026593. The cubic root of 72300021 is about 416.5938053575.

Adding to 72300021 its reverse (12000327), we get a palindrome (84300348).

The spelling of 72300021 in words is "seventy-two million, three hundred thousand, twenty-one".