21140212201 has 4 divisors (see below), whose sum is σ = 21166737732. Its totient is φ = 21113686672.

The previous prime is 21140212189. The next prime is 21140212229. The reversal of 21140212201 is 10221204112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17376512400 + 3763699801 = 131820^2 + 61349^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140212201 - 2⁹ = 21140211689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140212241) 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, 13261570 + ... + 13263163.

It is an arithmetic number, because the mean of its divisors is an integer number (5291684433).

Almost surely, 2^21140212201 is an apocalyptic number.

It is an amenable number.

21140212201 is a deficient number, since it is larger than the sum of its proper divisors (26525531).

21140212201 is an equidigital number, since it uses as much as digits as its factorization.

21140212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26525530.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21140212201 its reverse (10221204112), we get a palindrome (31361416313).

The spelling of 21140212201 in words is "twenty-one billion, one hundred forty million, two hundred twelve thousand, two hundred one".