21203002011 has 8 divisors (see below), whose sum is σ = 28294611984. Its totient is φ = 14123363360.

The previous prime is 21203002003. The next prime is 21203002081. The reversal of 21203002011 is 11020030212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21203002011 - 2³ = 21203002003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21203002081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2988696 + ... + 2995781.

It is an arithmetic number, because the mean of its divisors is an integer number (3536826498).

Almost surely, 2^21203002011 is an apocalyptic number.

21203002011 is a deficient number, since it is larger than the sum of its proper divisors (7091609973).

21203002011 is a wasteful number, since it uses less digits than its factorization.

21203002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5985661.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21203002011 its reverse (11020030212), we get a palindrome (32223032223).

The spelling of 21203002011 in words is "twenty-one billion, two hundred three million, two thousand, eleven".