21023013001 has 8 divisors (see below), whose sum is σ = 21094806024. Its totient is φ = 20951255040.

The previous prime is 21023012993. The next prime is 21023013013. The reversal of 21023013001 is 10031032012.

It can be written as a sum of positive squares in 4 ways, for example, as 4057690000 + 16965323001 = 63700^2 + 130251^2 .

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 21023013001 - 2³ = 21023012993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023013701) 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, 1839561 + ... + 1850953.

It is an arithmetic number, because the mean of its divisors is an integer number (2636850753).

Almost surely, 2^21023013001 is an apocalyptic number.

It is an amenable number.

21023013001 is a deficient number, since it is larger than the sum of its proper divisors (71793023).

21023013001 is a wasteful number, since it uses less digits than its factorization.

21023013001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17531.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21023013001 its reverse (10031032012), we get a palindrome (31054045013).

It can be divided in two parts, 2102 and 3013001, that added together give a palindrome (3015103).

The spelling of 21023013001 in words is "twenty-one billion, twenty-three million, thirteen thousand, one".