420015601650721 has 4 divisors (see below), whose sum is σ = 425769240029572. Its totient is φ = 414261963271872.

The previous prime is 420015601650709. The next prime is 420015601650727. The reversal of 420015601650721 is 127056106510024.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82255013997025 + 337760587653696 = 9069455^2 + 18378264^2 .

It is a cyclic number.

It is not a de Polignac number, because 420015601650721 - 2²³ = 420015593262113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420015601650727) 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, 2876819189316 + ... + 2876819189461.

It is an arithmetic number, because the mean of its divisors is an integer number (106442310007393).

Almost surely, 2^{420015601650721} is an apocalyptic number.

It is an amenable number.

420015601650721 is a deficient number, since it is larger than the sum of its proper divisors (5753638378851).

420015601650721 is an equidigital number, since it uses as much as digits as its factorization.

420015601650721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5753638378850.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 420015601650721 in words is "four hundred twenty trillion, fifteen billion, six hundred one million, six hundred fifty thousand, seven hundred twenty-one".