21002140201 has 4 divisors (see below), whose sum is σ = 24002445952. Its totient is φ = 18001834452.

The previous prime is 21002140169. The next prime is 21002140231. The reversal of 21002140201 is 10204120012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21002140201 - 2⁵ = 21002140169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002140231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500152865 + ... + 1500152878.

It is an arithmetic number, because the mean of its divisors is an integer number (6000611488).

Almost surely, 2^21002140201 is an apocalyptic number.

It is an amenable number.

21002140201 is a deficient number, since it is larger than the sum of its proper divisors (3000305751).

21002140201 is an equidigital number, since it uses as much as digits as its factorization.

21002140201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000305750.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002140201 its reverse (10204120012), we get a palindrome (31206260213).

The spelling of 21002140201 in words is "twenty-one billion, two million, one hundred forty thousand, two hundred one".