420036721 has 8 divisors (see below), whose sum is σ = 454020224. Its totient is φ = 386292240.

The previous prime is 420036709. The next prime is 420036737. The reversal of 420036721 is 127630024.

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 420036721 - 2⁷ = 420036593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420036751) 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, 56091 + ... + 63136.

It is an arithmetic number, because the mean of its divisors is an integer number (56752528).

Almost surely, 2^420036721 is an apocalyptic number.

It is an amenable number.

420036721 is a deficient number, since it is larger than the sum of its proper divisors (33983503).

420036721 is a wasteful number, since it uses less digits than its factorization.

420036721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119511.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 420036721 is about 20494.7974130022. The cubic root of 420036721 is about 748.9090633940.

Adding to 420036721 its reverse (127630024), we get a palindrome (547666745).

The spelling of 420036721 in words is "four hundred twenty million, thirty-six thousand, seven hundred twenty-one".