727220021 has 8 divisors (see below), whose sum is σ = 802890144. Its totient is φ = 653143120.

The previous prime is 727219973. The next prime is 727220027. The reversal of 727220021 is 120022727.

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 727220021 - 2²² = 723025717 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 (727220027) 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, 397346 + ... + 399171.

It is an arithmetic number, because the mean of its divisors is an integer number (100361268).

Almost surely, 2^727220021 is an apocalyptic number.

It is an amenable number.

727220021 is a deficient number, since it is larger than the sum of its proper divisors (75670123).

727220021 is a wasteful number, since it uses less digits than its factorization.

727220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796611.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 727220021 is about 26967.0172803742. The cubic root of 727220021 is about 899.2669013676.

Adding to 727220021 its reverse (120022727), we get a palindrome (847242748).

The spelling of 727220021 in words is "seven hundred twenty-seven million, two hundred twenty thousand, twenty-one".