21040032001 has 8 divisors (see below), whose sum is σ = 21399420800. Its totient is φ = 20682969840.

The previous prime is 21040031959. The next prime is 21040032017. The reversal of 21040032001 is 10023004012.

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 21040032001 - 2¹⁷ = 21039900929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21040032901) 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, 563415 + ... + 599596.

It is an arithmetic number, because the mean of its divisors is an integer number (2674927600).

Almost surely, 2^21040032001 is an apocalyptic number.

It is an amenable number.

21040032001 is a deficient number, since it is larger than the sum of its proper divisors (359388799).

21040032001 is a wasteful number, since it uses less digits than its factorization.

21040032001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163319.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21040032001 its reverse (10023004012), we get a palindrome (31063036013).

The spelling of 21040032001 in words is "twenty-one billion, forty million, thirty-two thousand, one".