21032001001 has 16 divisors (see below), whose sum is σ = 23448434688. Its totient is φ = 18700205200.

The previous prime is 21032000939. The next prime is 21032001007. The reversal of 21032001001 is 10010023012.

It is a cyclic number.

It is not a de Polignac number, because 21032001001 - 2³³ = 12442066409 is a prime.

It is a super-2 number, since 2×21032001001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032001007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 774036 + ... + 800746.

It is an arithmetic number, because the mean of its divisors is an integer number (1465527168).

Almost surely, 2^21032001001 is an apocalyptic number.

It is an amenable number.

21032001001 is a deficient number, since it is larger than the sum of its proper divisors (2416433687).

21032001001 is a wasteful number, since it uses less digits than its factorization.

21032001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28292.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21032001001 its reverse (10010023012), we get a palindrome (31042024013).

The spelling of 21032001001 in words is "twenty-one billion, thirty-two million, one thousand, one".