21203120201 has 4 divisors (see below), whose sum is σ = 21204000000. Its totient is φ = 21202240404.

The previous prime is 21203120177. The next prime is 21203120203. The reversal of 21203120201 is 10202130212.

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 not a de Polignac number, because 21203120201 - 2³⁴ = 4023251017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203120203) 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, 402701 + ... + 452298.

It is an arithmetic number, because the mean of its divisors is an integer number (5301000000).

Almost surely, 2^21203120201 is an apocalyptic number.

It is an amenable number.

21203120201 is a deficient number, since it is larger than the sum of its proper divisors (879799).

21203120201 is an equidigital number, since it uses as much as digits as its factorization.

21203120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879798.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21203120201 its reverse (10202130212), we get a palindrome (31405250413).

It can be divided in two parts, 212031 and 20201, that added together give a palindrome (232232).

The spelling of 21203120201 in words is "twenty-one billion, two hundred three million, one hundred twenty thousand, two hundred one".