21020201201 has 4 divisors (see below), whose sum is σ = 22126527600. Its totient is φ = 19913874804.

The previous prime is 21020201183. The next prime is 21020201221. The reversal of 21020201201 is 10210202012.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020201201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020201221) 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, 553163171 + ... + 553163208.

It is an arithmetic number, because the mean of its divisors is an integer number (5531631900).

Almost surely, 2^21020201201 is an apocalyptic number.

It is an amenable number.

21020201201 is a deficient number, since it is larger than the sum of its proper divisors (1106326399).

21020201201 is a wasteful number, since it uses less digits than its factorization.

21020201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106326398.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21020201201 its reverse (10210202012), we get a palindrome (31230403213).

The spelling of 21020201201 in words is "twenty-one billion, twenty million, two hundred one thousand, two hundred one".