21203023012 has 12 divisors (see below), whose sum is σ = 38108136220. Its totient is φ = 10314984096.

The previous prime is 21203023007. The next prime is 21203023027. The reversal of 21203023012 is 21032030212.

It can be written as a sum of positive squares in 2 ways, for example, as 20111777856 + 1091245156 = 141816^2 + 33034^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 71631687 + ... + 71631982.

Almost surely, 2^21203023012 is an apocalyptic number.

It is an amenable number.

21203023012 is a deficient number, since it is larger than the sum of its proper divisors (16905113208).

21203023012 is a wasteful number, since it uses less digits than its factorization.

21203023012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143263710 (or 143263708 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21203023012 its reverse (21032030212), we get a palindrome (42235053224).

The spelling of 21203023012 in words is "twenty-one billion, two hundred three million, twenty-three thousand, twelve".