21020200012 has 24 divisors (see below), whose sum is σ = 42113292704. Its totient is φ = 8993037312.

The previous prime is 21020199989. The next prime is 21020200057. The reversal of 21020200012 is 21000202012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634383 + ... + 666694.

Almost surely, 2^21020200012 is an apocalyptic number.

It is an amenable number.

21020200012 is an abundant number, since it is smaller than the sum of its proper divisors (21093092692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020200012 is a wasteful number, since it uses less digits than its factorization.

21020200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301665 (or 1301663 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21020200012 its reverse (21000202012), we get a palindrome (42020402024).

It can be divided in two parts, 210202000 and 12, that added together give a palindrome (210202012).

The spelling of 21020200012 in words is "twenty-one billion, twenty million, two hundred thousand, twelve".