2001425721 has 8 divisors (see below), whose sum is σ = 2668836960. Its totient is φ = 1334149152.

The previous prime is 2001425717. The next prime is 2001425771. The reversal of 2001425721 is 1275241002.

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

It is not a de Polignac number, because 2001425721 - 2² = 2001425717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001425691 and 2001425700.

It is not an unprimeable number, because it can be changed into a prime (2001425771) 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, 8590 + ... + 63848.

It is an arithmetic number, because the mean of its divisors is an integer number (333604620).

Almost surely, 2^2001425721 is an apocalyptic number.

It is an amenable number.

2001425721 is a deficient number, since it is larger than the sum of its proper divisors (667411239).

2001425721 is a wasteful number, since it uses less digits than its factorization.

2001425721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67335.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 2001425721 is about 44737.2967556154. The cubic root of 2001425721 is about 1260.2203614335.

Adding to 2001425721 its reverse (1275241002), we get a palindrome (3276666723).

The spelling of 2001425721 in words is "two billion, one million, four hundred twenty-five thousand, seven hundred twenty-one".