21002013001 has 16 divisors (see below), whose sum is σ = 22193499328. Its totient is φ = 19848628800.

The previous prime is 21002012971. The next prime is 21002013007. The reversal of 21002013001 is 10031020012.

It is a cyclic number.

It is not a de Polignac number, because 21002013001 - 2⁹ = 21002012489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002013007) 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, 251506 + ... + 324436.

It is an arithmetic number, because the mean of its divisors is an integer number (1387093708).

Almost surely, 2^21002013001 is an apocalyptic number.

It is an amenable number.

21002013001 is a deficient number, since it is larger than the sum of its proper divisors (1191486327).

21002013001 is a wasteful number, since it uses less digits than its factorization.

21002013001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73192.

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

Adding to 21002013001 its reverse (10031020012), we get a palindrome (31033033013).

The spelling of 21002013001 in words is "twenty-one billion, two million, thirteen thousand, one".