21203202011 has 4 divisors (see below), whose sum is σ = 21294203112. Its totient is φ = 21112200912.

The previous prime is 21203201989. The next prime is 21203202037. The reversal of 21203202011 is 11020230212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21203202011 - 2²² = 21199007707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203202061) 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, 45500201 + ... + 45500666.

It is an arithmetic number, because the mean of its divisors is an integer number (5323550778).

Almost surely, 2^21203202011 is an apocalyptic number.

21203202011 is a deficient number, since it is larger than the sum of its proper divisors (91001101).

21203202011 is an equidigital number, since it uses as much as digits as its factorization.

21203202011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91001100.

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

Adding to 21203202011 its reverse (11020230212), we get a palindrome (32223432223).

The spelling of 21203202011 in words is "twenty-one billion, two hundred three million, two hundred two thousand, eleven".